Sakurai has mentioned Geno
once when discussing the different DLC mii costumes; Geno wasn't even the focus of the interview.
Conversely, Sakurai has mentioned
Persona twice, praising it's UI (which shows in Ultimate) and talking about the great experience he had at the Persona Super-Live P Sound Bomb!!!!! 2017 (I think he talked about Persona 3 once, and how long it was). He's mentioned Dragon Quest countless times (most of which are referenced in my Ultimate Square Enix character argument if you wish to reference that).
It's more anecdotal evidence, given that Sakurai rarely references the modern games in playable form. The most recent Kirby game represented is Return to Dreamland from the Wii, which is referenced by Kirby's Final Smash.