A radfem talking about women being more productive than men is comparable to Marxists talking about workers being more productive than capitalists.

I'm not sure it is comparable, they seem to complain a lot about "low value males" just playing video games and not producing enough (not even that they are exploiting women while doing that, just that they're not producing) which has very creepy overtones. It's more like if marxists complained a bunch about lumpen instead of capitalists.