I feel like everyone is just making super arbitrary use of the word "work" to make their point- are we marxists or not? Work is work whether it "feels" like it or not. Also, the sub heading itself literally doesn't say that, it reads:

A subreddit for those who think life's too much work and that we could use a little less, if any at all.

When you are fully committed to something that you are working and not alienated from that labor, whether it be writing a story, or building something for your community- oftentimes in the moment itself, you wouldn't describe yourself as "happy", but you're driven to continue, not out of any direct joy in the moment but because of how meaningful the work is. There's nothing wrong with criticizing wage slavery, but being against the concept of "work" itself is just dumb and a bad direction for the left to go.