If Antec says it is compatibl;e I think that they have the last word. The Newegg blurb looks like it is dated before the 1155 came on the market. The cooler predated the SB platform.
I use this website for evaluating coolers: http://www.rwlabs.com/.
They have an extensive database and you may be able to find comparison info on the Antec and alternatives.
BTW i am a fanboy of the Antec H20 series and run the 620 on my home server and the 920 on my gamer.