This is bullshit, didn't purchase studios that haven't released games. All the acquired studios are very experienced, and even working with Sony
Sony made many games with Bluepoint, Insomniac or Housemarque before acquiring them. Same goes with Firesprite, who are basically Liverpool Studio + Evolution + Bizarre Creations + Supermassive and even worked as Firesprite with multiple Sony projects before acquisition.
Sony has been the publisher of Destiny 1 and 2 in Japan and had the marketing+bundles+betas+etc deal with them. So they have been working with Bungie (that includes Firewalk, who basically are ex-Bungie with some ex-CoD devs) for a while.
The Haven folks are ex-EA and specially Ubisoft, who already partnered with Sony in these same marketing deals in many of the top hits they worked on in series like Assassin's Creed, Watchdogs, For Honor, Far Cry etc. Some of which, like Destiny, were back then record breaking AAA new IPs.
Lasengle is the dev of a Sony mobile game that generated over $7B in revenue.
Valkyrie is a support team who had a long history of working in Sony games before its acquisition, they worked in series like GoW, Infamous, Twisted Metal. More recently they also worked in Concord.
Nixxes was bought because they're the best console to PC porters in the market, and worked as support team in Killzone Shadow Fall.