First of all, no disrespect to Fred Hampton or his son but only Bobby Seale is the other true founder of the party itself.
Fred Hampton was a prominent Chicago charter member but Huey and Bobby are the only true co-founders of the Black Panther Party itself. If somebody is going to speak out on the existence of a Panther group, it'd be him, just as he did against the New Black Panther Party of Dallas back in the early 00s.
Secondly, I'd take Bobby's word over Hampton Jr, and no offense to him, but he and his group are no different than the group in Philly, the only difference is that he's the son of Fred Hampton, so he may feel his word has authority but he nor his father were/are official spokesmen of the OG Black Panther Party that has been defunct for decades.
Bobby Seale hasn't even spoken on this matter yet, I'd wait for him to actually give his opinion before we discredit the group in Philly and all the work they've done in their community for years.