Yes, according to Jain cosmology, the earth (Jambudvipa) gradually rises by one yojan in height after the time of each Tirthankara, specifically after Lord Munisuvrata Swami, who was the 20th Tirthankara of the current Avasarpini (descending half-cycle of time).

The Jain scriptures explain that after the nirvana of Bhagwan Munisuvrata Swami, the land of Bharat Kshetra (part of Jambudvipa where humans reside) increases in height by one yojan (a traditional unit of distance, roughly several miles or kilometers). This rise in land is associated with the gradual decline in human lifespan and stature, as well as moral and spiritual capacities in this era.

This concept is detailed in texts such as the Tiloyapannatti and other Jain cosmological works, which describe the changes in Bharat Kshetra's geography and humanity's conditions throughout the time cycles.

So, your statement aligns with Jain cosmological teachings.