Figured this would happen. Just didn't know if it would include the 3DS version.
I didn't play the original yet, even though I have it on PS4. Glad I waited. I'll play this version instead.
I remember when someone told me they thought Persona 5 S stood for Switch, I said publishers these days want to avoid putting console names in titles as that can complicate things for future ports, they pointed at Dragon Quest XI S as an example of where someone did this.
I don't know if it was Square's intention to allude to the Switch with the S, but even if it was, this is why they wouldn't commit to spelling out the whole name.