It looks like the last verified contact with them has been in 2018. Recently a youtuber went there and tried to get their attention, but couldn’t find them.
Is it possible they’re not even still around? Maybe a disease found its way onto their island and took them out. It could have even been from the last visitor in 2018.
I come from Texas where we have a proud tradition of shooting solicitors for knocking too loud. I very much empathise with the Sentinelese. Leave them the fuck alone. They have been there for 50 thousand years. Let them be.