This might also be a shit take, but you're both right IMO. On the one hand people announcing they're off social media IS pretty melodramatic, but on the other hand, the person doing it also developed a very popular mod toolbox and it's probably important for those that use it to know he's stepping away.
If you don't understand why he's doing it then you've never done anything of value w/r/t community projects and your opinion belongs in the toxic wasteland with all the others.