Labour is doing productive things, work is employment. Antiwork and other related things like "the abolition of work" by Bob Black are against wage labour and capitalist exploitation moreso than the need to do things to keep the world turning.
Do they offer any alternative? I'm all for payment shifting from 'buts in seats' to 'paid for productivity' if there's proper allowance for taking time for quality, but somehow that doesn't seem the kind of direction people are thinking in.
Most anarchists don't recognise anarchocapitalism as a legitimate form of anarchism because anarchism is against coercive hierarchy and capitalism is inherently coercive. Plus a real life ancapistan would inevitably devolve into feudalism.
Also a lot of them are Hoppeans and that just makes them authoritarians.
Hopefully capitalism will one day automate everything to the point no labor is necessary and society will evolve into post scarcity rather than communism.