DS had a year or 2 where it hit just over 30 million, based on charts I've seen posted.
Sony is playing catch-up now that supply constraints are gone, so yes I 100% believe this leak. Based on their own stated goal of surpassing the PS4 sales curve next FY, they have to move at least 22 million units. I think 30.5 will be doable given how hard they're pushing. The new model will begin production in April according to Tom, so plenty of stock for the September release
Over 30million home consoles is a LOT. The DS and Switch could do it/come close to it because they are also handhelds. There are households that have 3 or more Switches, between parents and kids, while a PS5 needs its own TV over it.
Having said that, Sony has a lot going for them, and that 30m number could become a reality. Personally I would put it at 26m and if it's more then, oh well, even better.
PS5 numbers will be boosted by:
Hogwarts Legacy which is a defacto next gen game now and is marketed with Sony.
FF16. This will greatly boost the Japan numbers too.
Spiderman 2 (this is the big one).
FF7 Rebirth (they said next winter, Dec 2023, Jan & Feb 2024, so well into the FY. ofc the game could be delayed to May or whatever so that would exclude it).
New PS5 model (cheaper to make while streamlining the production process by not having two models. if they have $399 PS5s in-stores, these will fly off the shelves).
Good chance to have a beta for TLOU Online this year (the show being a runaway success will be a major boost to draw in more casuals).