I don't believe so (for lena at least). I have purchased those two Targetmasters for United Artfire as additional accessories for other figures. They appear as good as the real thing.
I previously purchased some ridiculously cheap toys from similar sellers in the past, and the quality does not feel like KO's. Granted, they one of the figures does feel like it was on the low end of passing QC, and another had a minor gimmick that didn't work. This leads me to believe that the products sold by such sellers are legitimate Hasbro factory products, that have somehow made their way out of the factory.