I think the incel crowd generally want to strip women of their rights because they see women's liberty as a main reason they can't get laid.
So, I'd imagine the childless cat women thing could hit with them because they'd be like "yeah, women should stop being so up-tight and have my babies!"
Or something like that.
2000 is really solid to achieve a reasonable margin of error. It's a pretty simple formula taught in any basic stats class.