Isn't that contradicted in Fig. 3 of parent's [0]?

Might have been true until 2015 but not anymore.

Yes, younger women friends post on Facebook how they're stopping work for the year in October (?) to make up for the pay-gap. I assume maybe that's true to some extent in USA -- they're certainly sold on the idea all the men around them are getting an easy deal.

Doesn't that just mean they'll widen the pay gap by not getting paid in October? Then next year they'll need to take two months off, and so on.

At least they'll have plenty of time to post about it on Facebook :)

It's a meme "we should stop working in October [IIRC] because we are only paid for 10 months compared to a man's full year". It's not an actual plan.

I've seen this specific meme a few times; dozens of posts about gender pay gap including from under-30 part-timers who have a good chance - according to the available stats - of being paid more than men in an equivalently skilled role.