What is G3 in G5?

[eventyraren 180]

So in the "danger danger" song we see that G1 is just a tv show in G5. That do not work wit the first G1 show, but MLP Tails only has earth ponies. But what about G3. Where do that fit in this time line? 

[EpicEnergy 23,218]

I interpret G1 being a TV show in G5 as a reference only, not as canon. The developers clearly wanted to put a reference in there towards G1, just like they put a Rick and Morty reference in one of the episodes in FiM, but such references are just that - references only.

[Equus 91]

None of the other generations besides G4 are relevant in G5 except as jokes since G4 and beyond rebooted completely. Not even sure how much of G4 is relevant but that's the only other generation that's actually real in that generation

[Sonic Shimmer 4,132]

I'd imagine they see it as a very dark period in their history and it's taboo to discuss it.

[ShadOBabe 18,997]

The other generations are different universes. Only G4 and G5 are directly connected.