There has been a lot in the news about that here.
Unlikely, there could be a few old Pulcher still alive after twenty odd years in a tanks here and there. The majority went to Japan. After they went extinct in Thailand, there were still some available from Cambodia. I used to have a few.
As for the one advertised, it may not be an ST. It could be a mature three bar IT. It would be difficult to tell the difference.
The main difference that I could note is that IT get bigger and bigger, where as ST used to get to about fifteen inches, and the fatten out a lot.
The advert said that there were more available. I would not trust the advertiser. There has been a little outrage at the advert. if it were real, it would be highly illegal. I think it is merely generating hype - as is frequently done on the internet.
Do not expect to ever get a real ST.
IT, NTT, NGT and AT are still available, are great fish and I recommend them all.