Jean_Luc made his last post on October 11, 2020, and he was last active July 28, 2021 (more than 6 months ago). His last commits on github were also a year ago (February 2021)
Is everything ok with TC? (Jean_Luc)
I think he is just not interested anymore, as #120 seems to be unsolvable in reasonable time with the current software & hardware.
I do not know, maybe there were other tensions, maybe some users wanted to use him as a free source of tools to crack bitcoin. No idea, but reading his topics I see there were many demanding ignorant.
Or maybe he is still here, using other account. Who knows.