I checked out of antiwork about the time of their TV/PR fiasco. I know the original intent of the sub was to be opposed to all work (I am oversimplifying), but it was coopted by a larger "lets make work better by calling out bad actors and bad behaviors" movement, which is what attracted me to it. Then the original mods kinda shot the movement in the foot and I stopped checking in.

Is the new /c/antiwork a return to their roots of "all work BAD, down with all work" or the larger "lets make work better" ethos?

the name "anti-work" used to be a movement against work entirely (i.e. the abolishment of all labor altogether). I don't think that's a viable societal system. There is no known system in human history where majority of the population can gain economic rewards from not doing anything in return.

Work reform doesn't aim to abolish labor, but it aims to increase the share of rewards reaped by the workers (as opposed to capitalists - be it shareholders or owners).