There was discussion of this exact point on the network that shall not be named. The consensus among among those legal scholars was that Hunter has no fifth amendment protection given the pardon. Hunter can be hauled before investigative committees and compelled to answer.

If it was later proved Hunter committed perjury giving such testimony, I would think that would be a separate crime falling outside the scope of the pardon and be subject to prosecution.

Exactly right.
democrats normally can lie to Congress, refuse subpoenas, and perjure themselves. See Holder, Eric and any number of Obama- and Biden-era intel and DHS officials who got off scot-free while Republicans were fried.

That won't happen any longer. I don't care about Hunter Biden anymore; with Joe senile and everyone knowing who he is the only method he has left to make any money is to smear his own feces on a pieces of canvas and auction it off at a left-wing money laundering even-, er, "art auction".

But there are still people who need to be hauled up in front of Congress and held to account. Mayorkas heads that list followed by the former and interim heads of the Secret Service. They played games while Americans died, and we can't have that. There's a seat reserved for one Anthony Fauci as well.