The burden of proof is on the person claiming the widespread organ failure. I can't provide a study saying it doesn't happen because there's not studies saying it does happen for those studies to debunk :)

But, here's one group of case reports that is commonly held up as evidence of the supposed strokes in young people / widespread organ failure / etc:

"Large-Vessel Stroke as a Presenting Feature of Covid-19 in the Young" - https://www.nejm.org/doi/full/10.1056/NEJMc2009787?query=rec...

EDIT: Oh, or were you referring to sources around the impacts of systemic inflammation? I can certainly provide those if you're interested.