Ehhh...I mean, nothing she says here is horribly wrong. It's true that everyone should know what everyone's doing and that good communication is extremely important. I don't know about the "If you're prone to jealousy, please do not attempt poly" part - certainly if you experience jealousy frequently and often and can't stand the thought of your partner with anyone else, polyamory probably isn't for you. But jealousy does still happen in polyamorous relationships, it's just the solutions are maybe somewhat different than what you'd use in a monogamous relationships. But I'm not certain she's trying to say there's no jealousy ever, so... Cheating isn't condoned; neither is pressuring your partner into trying polyamory (though it's not like cheating or pressuring your partner into stuff is considered good in monogamous relationships, either).

It does annoy me that she uses the shortened word "poly" for "polyamory" because I've only ever heard it used as a shortened version of "polyamorous" - i.e., "I am poly" but never "I read a book about poly." However, I may have just missed that, maybe people do use "poly" for both.

Mostly it's just her attitude here that seems really obnoxious to me. You could give a basic primer on polyamory without all the "NO, I don't blah blah blah" and the dos and don'ts and the "I don't have time to explain the difference between swinging and polyamory to you, just Google it," (Here it is in one sentence, as I understand it: "Swinging focuses on casual sexual encounters while polyamory, while sometimes including such encounters, implies a seeking of or at least an openness to more than one committed romantic relationship.") Just...just...UGH. The whole entry really grates on me.