The Super Timeline is wonky as hell anyway. I mean it just started with Bulmas Birthday, and of course she said she is younger than she actually she should have been at that point. (Common headcanon, she just lied about her age, like many middle aged woman do.) But than there is the fact that there have been multiple smaller timeskips between the arcs and Goten and Trunks just didn’t age at all. Just look at how Trunks looks at the end of super and then compare it to how he looks at the beginning of the History of Trunks Special, which is canon, because it was also in the manga, and takes place in the same year as the tournament of power.
Super is just a continuity breaker. Partly because Toriyama is just very forgetful and either doesn’t care about what he did 20 years ago, or just can’t remember it, and is too lazy to look it up and fit it in.
But it isn’t like that is new behavior. Toriyama always did whatever he liked, changing the rules as he was going, (like in the Buu Saga, changing that the namekian Dragon Balls can now also multi resurrect.) Coming up with new ideas and plot point as he went. The results vary from genius moments to simply very bad writing.
“In three years two androids will appear, they are called C19 and C20”, upps my editor didn’t like them here have have these twins called 17 and 18, heck I through in 16 as bonus. Too bad my edittor doesn’t like them either, lets see… man that bugs me, !!! giant Bugman. Wait he doesn’t like him either, ok here he will tranform into this batman dude, still not satisfied? Here is his perfect form. <- the Cell Saga in a nutshell.