It's quite the opposite.
The callback you're referring to here is in fact exactly the kind of example that Robby is talking about
because there's no fucking way in this WORLD Toriyama remembers these creatures whatsoever.
One thing I like about the SUPER manga is that it often does callbacks like these--it takes old characters and settings and gives them some new way to be a part of the world.
It suggests a kind of internal logic to Dragon Ball as a setting... that is almost
antithetical to the spirit of Dragon Ball. I would've appreciated SUPER as a child!
But the repeated jarring moments that explain why This Time they can't do The Thing they did last time to deal with this particular threat, or the REALLY old techniques or characters making a new reappearance, they aren't Toriyama in style at all. Toriyama is not a detail oriented mangaka.
And I popped over to one of the Dragon Ball forums you mentioned to prove this point.
These are quotes from interviews he's given over the years. And this is just a small sampling of things Toriyama forgot over the decades.
Read his own words!
(
He forgot who Taopaipai was, who Lunch was, who Goten was, that Super Saiyan 2 exists, that he created Broly, etc.)
That he forgot them isn't necessarily a bad thing: it's just aren't important to Toriyama at all. There's so many weird quirks and bits of humor that SUPER doesn't have, but strange deep cuts to characters from thirty years ago? Back and forth banter about spirit fission? Oh it has that!
It's one of but many clues that suggest Toriyama isn't steering the ship, but a superfan of his work
is.
And it shows!