Modders found a way. Lance McDonald also has a way to get it running on an updated non-jailbroken PS5 by transferring it from a jailbroken PS5. Only caveat is that you must already have P.T. on your PSN account list.
https://www.youtube.com/watch?v=41P6cAbnQGI
P.T. running on jailbroken PS5
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