Actually it's not funny at all. In case you missed it. The "Russian collusion" investigation was filled with leaks from anonymous sources that didn't pan out. Which only showed that leaks and "anonymous" sources speak to "reputable" news sources to push an agenda.
The repair shop owner's name is John Paul Mac Isaac, not sure why you think "single repair shop guy at his word, despite him also being unnamed " because that is clearly wrong.
We have 50 former intel and military people coming out on the "Russian disinformation" side. All these ex officials were in charge when Biden was doing his shady deals, and many have known ties to Chinese money, gov't, and orgs. I wouldn't take their word for it, they have no more information than you or I. They don't want to disrupt the gravy train. It's in their interest to push this line given much of the purported info in the emails is China related.