Answer

The key word is bhavapratyaya in the sutra: bhavapratyayo’vadhiḥ deva-nārakāṇām (Tattvartha Sutra 1.21). It means “clairvoyance arising by birth/nature,” and the sutra says it belongs to devas and hell-beings. ( jainqq.org)

Explanation

So the sutra is talking about avadhi-jñāna (clairvoyance), not directly about “past memory.” If by “past memory” you mean remembering previous births, that is a different idea; this sutra specifically says devas have innate clairvoyance from birth. ( jainqq.org)

Spiritual Understanding

In Jain Dharma, this shows that devas have a special kind of natural perception due to their birth condition, but it is still not omniscience. The higher and purest knowledge is kevalajñāna. ( jainqq.org)

Takeaway

If you want the one word, it is bhavapratyaya. If you want, I can also show you the exact Digambara Sanskrit and simple meaning line by line.