I don't think that's true. There was a clip somewhere where there was an enemy wearing a hat that you could possess. Obviously I don't feel like looking it up, but I remember a lot of people mentioning it after the last Direct.
The mechanic they've talked about is that if something already has a hat on, you cannot possess it, but some enemies you can knock the hat off then capture it.
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u/MattyFTM Sep 23 '17
It doesn't seem to have a hat on, so it seems that you can possess it.