Yes, it does appear his son Hunter was on the take in China and Ukraine. It sounds like a cruder version of Hillary’s pay-to-play scheme sans the niceties of a “charitable” foundation laundry. (And look how she got clean away with it. Galling, isn’t it?) This was known before the election. If the “ten percent for the Big Guy” thing pans out to be true and provable, there could be a good case for impeachment.
Grassley and Johnson did indeed transmit their report to Barr and pressed the DOJ to determine whether Hunter should have registered as a foreign agent. So far, crickets from DOJ. I do not recall Grassley saying Hunter was “an official spy”. (Foreign agent and spy are not exactly the same thing!)
I can’t see how Biden “wouldn’t be president or Commander in Chief” as he was sworn in on January 20. It’s a done deal. He is legally president. The only legal means of removing him from office is impeachment followed by conviction.