Wrong.

On his video it says Museu De Belles Arts De Valencia. What you linked is Bellas Artes in Argentina.

Correct link is:
[link to museobellasartesvalencia.gva.es]

and translated info about current exhibitions:
[link to translate.google.com (secure)]

[link to translate.google.com (secure)]

and here are their covid rules:

[link to translate.googleusercontent.com (secure)]

saying they have limited capacity, etc.

So... either he filmed it between 10PM-6AM through connections or he cleverly edited it (even deleted people) or he's legit.

THIS is how you research properly.