Yeah, you keep downplaying it and making a bizarre and false equivalence between some fabricated 'purge' that never happened (in fact, in the opening months of Starmer's leadership I've seen far more brazen calls for purges from the centre of the party than ever came from the left).
The attempt to 'both-sides' what happened is risible. If you care so much about a Labour party that has lost four consecutive elections, it's hard to fathom why you are so blase about senior figures within the party working against its election in 2017, at a time when a few thousand votes in the right places could have seen a Labour government. But no, not a big deal, let's move on, the dossier was compiled by Corbynistas, the left was doing a mass purge anyway, and you're super concerned about winning power but super unconcerned by efforts from within to work against that outcome. Odd.