You are touching an interesting point, but it is being pushed a bit further than what the Jain scriptures themselves say.

Let’s separate a few things clearly:

1. Vidyādhara / Matanga vaṁśa in Jain Purāṇas

- Jain Purāṇas (like Padma‑Purāṇa, Harivaṁśa‑Purāṇa, etc.) do describe various Vidyādhara dynasties, special human‑like beings with aerial powers, special weapons, vidyās (occult knowledges), etc. - Among them, there are references to different Vidyādhara lineages (vaṁśas). In some traditions a Matanga line is mentioned; details like “Matanga, son of Vinami” are part of these narrative chains. - These stories explain how particular groups or clans arose, how certain vidyās (like “Mātangī‑vidyā”) passed from one person to another, and how different tribes such as Vanaras, etc., fit into the Jain cosmological world.

1. But: canonical events do not “depend” on a single narrative chain

In Jain Darshan, there is a big difference between: - Eternal truths / nitya‑tattva – e.g. existence of jīva, karma, saṁsāra, mokṣa, the 24 Tīrthaṅkaras in each half‑time‑cycle, structure of loka, etc. - Story‑details / vaṁśāvali – how exactly a particular dynasty arose, who taught which vidyā to whom, which king married whom, etc.

The eternal structure of the world (like the appearance of Tīrthaṅkaras, existence of human, deva, nāraki, tiryañc, and also Vidyādhara races) is governed by karmic law and fixed time‑cycles, not by one individual story detail.

So, even though our present text may say: - “Vinami had a son Matanga; Matanga founded a Vidyādhara Matanga‑vaṁśa; from this lineage came such‑and‑such,” it does not mean: - “If Matanga did not exist, then no Vidyādhara would exist,” or - “If Vinami was not his father, then the whole canonical history collapses.”

Jain Āgamas and Purāṇas never present that kind of “if‑not‑this‑person, then the whole universe changes” logic.

1. On your chain: Vinami → Matanga → Matangi‑vidyā → Vidyādhara / Vanara vaṁśa

What you are saying is roughly:

> If Matanga did not found the Matanga‑Vidyādhara vaṁśa, he isn’t Vinami’s son. > If he isn’t Vinami’s son, to whom did Vinami give the Matangī knowledge? > If Vinami was not born, no Vidyādhara vaṁśa; without that, no Vanara vaṁśa, etc.

From a Jain philosophical point of view, this is too strong a conclusion:

- In Jain karma‑siddhānta, vidyā and powers arise according to karmas of many souls, not fixed on one possible soul only. If some Matanga did not exist, another karmically‑qualified jīva could receive and transmit that vidyā. - The existence of Vidyādhara and Vanara categories as such is part of the eternal cosmological design. Their exact genealogical story (which king’s son, what name, etc.) can differ across Purāṇas and sectarian traditions, but their category‑existence does not vanish. - Therefore, the spiritual framework (Tīrthaṅkaras, four gatis, loka‑vyavasthā) does not rest on the factual existence of a single narrative link like “Matanga son of Vinami.”

1. How to understand such Purāṇic chains correctly

Traditional Jain ācāryas guide us to use Purāṇas in this way:

- Respect them as śāstric narratives that show karma, virtue, vice, and the fruits of conduct. - Do not let our faith in core tattva (jīva, ajīva, 7/9 tattvas, Ratnatraya, 24 Tīrthaṅkaras) depend on any one historical‑style “if‑then” chain. - Where different texts or sects (Digambar / Śvetāmbar) give different story details, we note them respectfully and focus on the common spiritual message, not on forcing a single rigid historical logic.

1. Balanced way to put it

So a more accurate and safe Jain way to phrase your last line would be:

- “According to certain Jain Purāṇas, Vidyādhara Matanga‑vaṁśa is one of the important lineages, and its stories are interwoven with other dynasties like the Vanaras.”

But we should not say:

- “If this Matanga‑vaṁśa did not exist, then the canonical events themselves (like existence of Vidyādharas / Vanaras, or the whole world‑order) would be impossible.”

The canonical events rest on eternal karma‑law and time‑cycles, not on one human (or Vidyādhara) lineage.

In short: Yes, Jain Purāṇas show Matanga and Vidyādhara vaṁśas as deeply woven into the narrative world. But no, Jain tattva does not say that without this exact Matanga‑lineage, the whole Vidyādhara or Vanara existence – or Jain canonical structure – would collapse.