Considering who is making this claim and how much they've lied recently, I'd be hesitant to give them the benefit of the doubt.
Simply put, that which can be claimed without evidence can be dismissed without evidence.
> What use is a follower graph if it doesn't correlate to the accounts on your platform?
Is asking about the point of scraping your Twitter social graph if they can’t actually align it with accounts on the platform. If you follow foo bar on Twitter, it doesn’t mean that foo bar on threads is the same foo bar. The Twitter social graph is useless unless to try to map to meta accounts.
When I logged in to Threads, it added my entire follower list of hundreds from Instagram.
Also, Instagram already links Instagram accounts with Facebook accounts for the majority of users so they graph is even bigger than that (with Facebook friends).