It was the leaked report, but IMO it didnt exonerate Corbyn per se, it provided firsthand evidence of the efforts made by the labour right to manipulate and amplify the anti-semitism smears, and in that sense its undeniable as all of the evidence was firsthand emails and various messages.
If Panorama was so bad, as your link claims why did Corbyn and co quietly drop their threatened complaints and legal action? It was the BBC. If it was a made up piece of shit they could press their case. But it wasn't and they have no case that'd stand up so they rely on wholly biased sniping like the link you've just posted.
They dropped the complaint after ofcom rejected dozens of public complaints, presumably as there was no point in pursuing it in light of the BBC's appallingly craven political coverage in recent years, particularly in the run up to the last election.
I suggest you look at that piece again. Regardless of whether you believe the allegations, the BBC is supposed to be impartial and not a tool for political smears. That panorama was a disgrace and has been dissected multiple times.
I understand, you hate Corbyn and are so inclined to believe every accusation against him. Thats fine - but most of the anti-semitism stuff is just so crudely constructed and flimsy it begs the credibility of any of its exponents.