If they're referring to Philly that chapter did indeed fuck up, but in a more complex way than what these serial abuser orgs like IMT do. The fucking up was in the (unfortunately common) "circle the wagons" response that many orgs have when something may damage their reputation. The stated logic is usually that someone is hurting the cause by making an accusation public, something that usually only happens when the org itself is fucking up and failing to adequately address abuse.

For PSL in Philly the context is a little more complex because the person coming forward was also actually very publicly threatening to doxx a lot of PSL members and far from just those accused. And to doxx them to the FBI, etc. Like the literal thing that orgs use as a false pretext for hiding abuse, only really threatening to do it. And the main issue is that their response ended up being to publicly address the person that came forward and with their name. Just a clusterfuck.

There's a lot more to it and I recommend looking into it because it was a case where a seemingly good faith non-cis-men-led grievance process failed and is an example to critique when supporting your own org's processes.