Well, I looked at the back of the packages at Target today, and they have a licensed by Hasbro label on them, so they might be like how Tonka is sometimes used by other companies, or other companies make Transformers stuff, like Super 7.It's just possible (this being Wikipedia) that someone had removed it during the window in which you consulted the site, but it's been there for some time. I checked it myself just after posting my comment (I'd already known that Hasbro had given up Micro Machines, but had forgotten the exact company, myself, and so wanted to check).
Also, there are the official Transformers Micro Machines that are out right now, so that is also a thing.