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As far as I know, he publicly renounced his decades old opinion even before the last witch hunt began.

Citation needed. He expressed the same opinion in 2013 that he did in 2006 and 2003:

And withdrew it in 2016...

Good for him - where can I read up on that?

But even if he hadn't changed his opinion there would be nothing wrong with that imo.

The same place you linked to.

Could you narrow that down? I tried, but there's a lot of material to go through.

The stuff I did find was only tangentially related and not indicative of any changes in position, eg