"They" or "Them" is often used in English for a gender-neutral pronoun even when referring to only one individual. "He" is also used as a default that needn't exclude women (or girls) but this can be considered non-PC (politically correct) these days ..and some writers now use feminine pronouns as a counter to this (which always seems weird to me -esp where the population is overwhelmingly male).

Short answer to OP is bet the flop or call that turn but don't get too attached to the hand. It is likely your TT is still good here. If your opponent calls or raises your bet then you should seriously consider that you might be in trouble.
Many people will bet any Turn after a check-check flop so his bet in this case had a very high bluff rate.

It seems to me, he was looking for general advice rather than a specific hand so the 'villain' doesn't matter.