There's no good reason to believe such a tomb was found. Have you reckoned with all the criticisms of that documentary, and with the fact that most experts reject its claims?

Ture, most experts reject the Christ myth theory, too, but they rely more on their bias than on good arguments, whereas that's hardly so for the criticisms of that documentary.

https://en.wikipedia.org/wiki/The_Lost_Tomb_of_Jesus#Criticism_of_the_documentary