It is very different because Safari is a pretty strong minority and not available to people not on Apple hardware. So few if any websites are going to require this attestation because most users will bail rather than buying a new phone.
That doesn't make it good, but it makes it far less concerning than the most popular browser by far implementing it.
TLDR: No. They're folding it into Android. And since developers are getting reassigned, from the perspective of that person, probably the entire team, it is indeed being abandoned. Except it is not.
https://httptoolkit.com/blog/apple-private-access-tokens-att...