Exactly what it sounds like.
They’ve put out a “Top 10 Party Commandments” with a big emphasis on consent (you can see below).
This is a big deal. Playboy has millions of (primarily male) readers, and the college-guy demographic is probably a substantial one (if anyone has a citation to back me up/disprove me, feel free to post it). Even the older male demographic ends up reading this sort of stuff.
Ergo, this is a step towards changing the college-culture view on rape (which at large is not good and is very ambiguous at best about consent), and while it’s obviously not perfect or magically gonna solve rape (even just on college campuses) instantly or even over time, this is still a really good thing.