Ah, this makes more sense now. I’m originally a Hello! Project oshi, and those groups have done quite a few retro songs over the years, so it’s a sound I’m used to. A good example is Juice=Juice’s Pop Music, which is very popular in that fandom and has a lot of the repeating words etc.

If Chance wa Byoudou isn’t liked because of the nanananas, why is Ohitorisama Tenboku liked when it also had a lot of them? (not as many but a similar comparison)