Well as long as the contract snippet you've shared is factual--and I'm assuming it is--and you're being told by many wise writers that it's shady and to be avoided at all costs, why wouldn't you want to attach it to the publisher's name and help to warn other writers? You don't have to be snarky and accusatory about it, just "this is a piece of the contract they sent me, and this is why I declined to work with them. The end."
The snippet was copied directly from the boilerplate contract on their website which they have linked to openly, so there's no problem there.
I will feed into the thread, but won't do it in advance of informing the publisher of my decision, and/or see what sort of negotiation is offered -- they have made it clear they are willing to negotiate their boilerplate contract, but I have to understand the language to do that. It doesn't feel professional to have it on an open forum with names and what not before I've done all that.