Musk has recently shifted to openly advocating for full-speed accelarationism, claiming that being a "biological bootloader for AGI" is a success condition for humanity. He's pretty clearly not concerned with preserving anything about the current state of the world.

Not against that concept in theory if it managed to be executed properly. Gene editing and centaurism always seemed natural next steps to me. I am willing to treat the viewpoint of some people wishing to slowing down or temporarily stopping such work in the sense that we must do a broader work of psychological/brain engineering to get people used to comfort and stop creating devils in their head when they are comfortable, otherwise I don't have any issues with transhumanism itself.