Well... I did tested without it and it...crashed again.
Now, I did reinstall 1.16.5 Forge and installed 239 mods (some are disabled) and runned Minecraft
I did not create a world, but here is the log:
https://gist.github.com/Th3600/594aed5e6229ccc76b4214debe6ff411
I did kill java after that, since it was consuming my RAM.
Strange that in the log I see that better diving, supplementaries and lots of other mods did have some strange problems in launch...