Hermen became the head of PS Studios (back then known as Worldwide Studios) in November 2019. Before him there was Shuhei Yoshida in charge. We know things like:
- Helldivers 2 started in 2016
- Gran Turismo Sport shipped in 2017, so pretty likely Gran Turismo 8 development started around there
- Guerilla hired the Horizon Online director to work on it early 2018
- Sony started to work with Concord "since the start", so maybe since Firewalk was founded in 2018 or maybe even (I doubt it) when they started the game in 2016
- In Japan Sony published both Destiny games since their release
- Somewhere in 2019 the TLOU2 MP mode branched out to become TLOU Online, so we don't know if Shu or Hermen greenlighted it, but I'd personally bet that it's more likely that was Shu
- London Studio released Blood & Truth in May 2019, so pretty likely their new IP GaaS was greenlighted before Hermen started
- Before all of them them Sony published other GaaS in the past like LBP, PS Home, GT Sport, the Everquest titles or DC Universe Online, and since launch was the publisher for Japan for games like Destiny 1 and 2
So no, Jimbo and Hermen didn't start the current GaaS push. As happens with the current PC push, it was started before them.
I'd bet that did cost something closer to 200 million because it's a AAA game with around 8 years of development made by a lot of veterans from games like Destiny, Halo or CoD and published by Sony.