When it comes to Gigatron, no one but Hasbro knows him as such. I believe this is another 'Tankor' style naming nonsense. They don't have to name him Gigatron but someone with pull thinks he should.
I think it's safe to assume that it's just a trademark issue.
I have the same problem with this as I did with Banzaitron. It looks nice, but no matter what colour scheme you put on this mold, it's still going to look like a robot skeleton samurai aka Bludgeon.