I would point out that what you call "left outlets" are at best center-left. The actual left doesn't believe in Russiagate (it was manufactured to ratfuck Bernie before being turned against Trump), and has zero love for Biden.

Given the amount of evidence that Russia and the Trump campaign were working together, it's devoid of reality to claim it's a hoax. I hadn't heard the Bernie angle, but it's not unreasonable to expect they were aiding Bernie. The difference being, I don't think Bernie's campaign was colluding with Russian agents, whereas the Trump campaign definitely was colluding.

Seriously, who didn't hear about the massive amounts of evidence the Trump campaign was colluding other than magas drooling over fox and newsmax?

https://en.wikipedia.org/wiki/Mueller_report

https://www.justice.gov/storage/report.pdf