Oh yeah, I remember that one.
I'd say I would expect to see stuff like this only in some of the novels rather than an official codex, but the writing has taken some strange turns in other recent studio material, too.
Now, it should be pointed out that it's not as bad as the neckbeard hyperbole suggests (it is very much a "enemy of my enemy is my friend" kind of temporary truce), but when the franchise spends 25 years of stressing that the IoM doesn't like aliens, it's hard to put blame with the fans for overreacting a bit to such things.
Edited by Lynata