My guess (pure speculation) is that Wipr sets the fingerprint to a well-known value for privacy / anonymization reasons, and Meta is indeed using that to suggest related accounts.
I very much doubt apple has an api for that and offers it to developers. Ad blockers have declarative and well known api that can't allow anything like this.
Who said anything about Apple? The OP who posted about wipr mentioned using a laptop.
Wipr is a safari adblock that is using apple sdk. It is written as a universal app and is available on both mac and ios.