The main point here is that Bitcoin transaction malleability has never been fixed. ONLY segwit malleability has been fixed, and segwit doesn't even exist yet. . .
"Segwit doesn't even exist yet"? AFAIK Segwit has existed already back in 2015 within Liquid, but it was only after Luke-jr found a way to implement it with a soft fork that the work started on it for the main implementation. Over the course of time, there was segnet and now it is also on the testnet. The people that have been testing there have mined several 'bigger blocks'. You obviously don't know what you're talking about.
We need to debate this stuff with clear minds and calm manner, otherwise it will be only a circus. So be more calm guys!
Take a look at part 8 or my thread titled "How I would take down Bitcoin" and you should clearly see what's going on.