It's actually quite old news, he has been busy suing Bitcoin Core developers since 2019 or even earlier than that.
Nobody seems to take his claims seriously anymore though, and that's a great thing.
According to OP's linked article, that claim was originally dismissed, but the court of appeal decided that there will be a trial.
No idea what are the implications of the mentioned 16 devs to just ignore it completely. I don't understand why he filed a claim in a UK court in the first place. As far as I know, not many of the influential devs are UK based.
And what's his endgame? There is zero chance he will get access to any of those addresses. Is he just abusing the legal systems to harass devs (vexatious litigation) in hopes that would somehow pump his BSV coin? I don't get it.