After reading that long list I'd say they are sick and tired of rude campers and getting bad reviews and being yelled at after kicking people out for not following even basic camping etiquette.
One of our regular CGs has always had pretty firm rules on pets and kids - to the point some get upset. I get a laugh out of those that complain online about their rules, which are clearly stated, but still people try to play like they didn't know the rules.
So the read receipt is their attempt to document you've been given, read and understand the rules - though it's not a very good way of doing it.
My only issue is that if they are having to make that big long list with ALL CAPS I'd think that CG has some massive problems going on and I'd probably avoid it just since I don't want the drama. I'm curious about your thoughts after your trip.