Everything after PS5's launch can be put into the new management and restructuring.
I doubt big japanese multiplats with big publishers will ever stop coming to all possible platforms, smaller devs or the ones looking for a publisher might not be arriving on PS anymore and instead steam.
I also don't see any more second party japanese productions for PS any time soon, the closest would probably be something like DS or some SE exclusive.
The new management was promoted in 2019 and PS5 got released in 2020. Games take several years to be developed, and 2020 was the covid year. Games like Miles Morales, Sackboy, Astro, Demon's Souls, Destruction All Star, Returnal, Ratchet, Uncharted Collection, PSVR2, Horizon 2 or GT7 and the released PC ports, etc plus the big 3rd party AAA exclusives released until at least 2021 or 2022 were greenlighted/signed by the previous managment. Even upcoming games like GoWR, TLOU remake, TLOU2 factions, Firewalk's game, Guerrilla's unannounced project directed by the R6 Siege guy, etc were also greenlighted by the previous management since they started before 2019.
The new management did the Kadokawa deal, acquisitions of Housemarque, Firesprite (+Fabrik), Blue Point, Nixxes, Valkyrie, Bungie, Lasengle or Haven, increased the already existting hirings of all internal development teams (after restructuring -not killing- Japan Studio), increased a lot the budget for 2nd party games and seems they are also increasing signing of 3rd exclusives (Jimbo said PS5 will have more exclusives than their previous consoles, and always 3rd party exclusives are the majority of the exclusives).
The new management also greenlighted Ghost of Tsushima DLC/DLC, Death Stranding Directors's Cut (2nd party Japanese production after their Japanese publishing team released Demon's Souls remake, even if developed in the west), the new IP of Bend Studio (Days Gone 2 never was pitched from Bend ot SIE/PS Studio management, internal Bend studio management blocked it. The new IP is the only pitch SIE/PS Studios got from Bend), Haven's 2nd (now 1st) party new IP, Deviation 2nd party new IP, Spider-Man 2, Wolverine and more stuff I may forget or that we don't know if started before 2019 (current Sucker Punch project, probably SSM new IP, current Sony London game, next Housemarque, game, next Bluepoint game, next Kojipro game (Death Stranding 2 according to Norman Reedus), multiple Firesprite projects, several 2nd party PSVR2 games, current Pixel Opus project etc).
The new management did a lot of things in 2 years and a half or so, including having the best console launch for a console ever even they got severly impacted by chips shortage, which later impacted them in a stronger way and prevented them to continue gaming history records in hardware sales.
Regarding 2nd party Japanese games, Hermen said that with the Japan Studio restructuring it branched off to become a their own office/team, after that team published Death Stranding Director's Cut and according to Hermen will continue publishing 2nd party games. But looking at the current Japanese market we can forget small average or bad games targeted to Japan only, instead more likely they will focus on games with a global appeal, as the ones made by From Software or Kojipro.
We also have to consider that as budgets grow every generation, 3rd party companies need more revenue so they prefer multiplatform games over exclusives, timed console exclusives over full exclusives, and to keep themselves the IP instead of giving the IPs to the platform holder which is what happens with Sony 2nd party games. It's also a safer and cheaper investment for the platform holder, in this case Sony, because for the same money they get more exclusives even if it's a 3rd party timed console exclusive instead of a full 2nd party exclusive.