Sites can get it wrong, ours gave 3 lads call ups when they were nowhere near the squad, including 2 to this specific U20 squad. It's the only place that actually says it was him which VFTB and Everton have then copied without checking.
Meanwhile an actual journo inside the ground insists it was Sa
and his club Famalicao are also claiming it was him.
And Portugal themselves have given it to Sa
https://www.fpf.pt/pt/News/Todas-as-notícias/Notícia/news/42039/contextid/178
Now all 3 of these could be mistaken and England be correct but I very much doubt Chermiti actually scored.