What's interesting is that SF.net seems to not care if you have removed the project. Or, even if the project never existed at SourceForge, at all. In the previous thread about this issue, someone linked to the sf-editor1 account, which has projects for a huge swath of software, including software that has never been hosted at SourceForge.
https://sourceforge.net/u/sf-editor1/profile/
It is part of their "mirror directory" project, which seems designed merely to get traffic from popular Open Source software, and occasionally inject malware into downloads that they can dupe people into getting from SF.net rather than the authoritative source.
And, of course, in this case, the author of Gimp-Win has plainly stated they did not abandon the SF project. They were locked out by SourceForge staff.
I'm all for caution before reaching for the pitchforks and the torches, but there's an awful lot of very large, very credible, projects saying, "Yes, SourceForge did this to our project."
I sent them an email yesterday asking for clarification, but have not received a reply.