He either did it manually or scripted it.
I think it's manually, he used to be quite selective deleting some posts, but only @nemo knows!
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5885 posts manully? I doubt it! @nemo how did you do it?
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it's not at one go, many were being deleted before, like a weekly cleaning ๐Ÿงน
but indeed there are quite some proof of work there - much deleting ๐Ÿ˜‚๐Ÿ˜‚