Like that TFWiki article said, the writer explicitly used the Gamma (comic) designation, and not Delta (live action) to not mess with the movie canon. The creator statements give further context to things which were already implied in the comic (Gamma-Delta distinction).
That's not what it says
exactly, though.
These are out-of-context anecdotes written by the poster on the wiki, not quotes from the writer.
Tyran 207.28 Gamma is the IDW Movieverse comics, also first mentioned in The Complete AllSpark Almanac. Pete was very careful about not touching the Bumblebee movie proper, so in this case it is a different reality than the one that actually featured the death in question of this Cliffjumper that Lady Cliffjumper is preventing.
Nothing written in this comic affects anything Hasbro is currently working on. These old continuities mean a lot to us fans, but to Hasbro they are considered dead continuities at this point, meaning this comic was able to freely play around with them like this. Back during the Fun Pub years, they couldn't touch the main continuities of the time (save for Animated which they only did in direct collaboration with Marty Isenberg and Derrick J. Wyatt, and only after that cartoon was fully over). But now, "What's it matter at this point?" Current Hasbro doesn't care, so it's whatever.
Nowhere does it explicitly say that they used the designation of the IDW comics to distance from Bumblebee. That's inferred from a second-hand account. That interpretation is something you might think based on what someone said about what someone else said.
What we see in the comic, more importantly, is:
1. All realities are the same designation as the continuities that they branch from.
2. The Bayverse should, as a result, be a branched timeline from the original continuity.
3. It branches, very specifically, from the events of the Bumblebee movie. This isn't really arguable, it's what the comic literally shows us. The writer even pretty much confirms as much by saying it's in 1987.
4. The designations are based on medium rather than universe, so really, the "Gamma" part doesn't make it a separate universe to Bumblebee.
I personally just find the reading that it is the same universe as Bumblebee and they're branching off from it more consistent with the story. Even if not, it still implies that the exact same events from Bumblebee were happening no matter what reading you ascribe to it.