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I think there's three different potential points/statements:

* a) The main overall productivity issue * b) Making a more general point that they don't seem very bright, at least compared to former colleagues * c) Specifically mentioning IQ score

Yes even though the main topic is (a)... b/c is just extra context.

I think OP's goal was to make point b/c to give some further context on their perception of the situation (whether it's true or not doesn't matter, the point is explaining what they think).

Sure both (b) + (c) especially can make you look like a dick, but I don't think making the (b) point is totally irrelevant to the overall post. It at least gives us more insight into what OP thinks, even if they're wrong.

So perhaps going the (c) route (rather than b) was just an attempt at trying to be slightly more objective (even though there's obviously no evidence at all). (b) is vaguer than (c), so I don't see that (c) was completely irrelevant, even though it comes across arrogant.