You;re assuming they know anything.
The only info really floating around is:
1. Leaked AMD data originating from the spring or summer saying PS5 is code name Oberon at 9.2TF. Info taken down
2. A ton of insiders saying the 9.2 TF is old data or fake data, and instead saying anything from "similar in power to SeX", "+/- 10% to SeX", and "a bit more powerful than SeX".
So even among the insiders, they don't even have consensus.
But whats ,going to happen is Sony will eventually reveal the data, DF or some spec site will do a full teardown analysis and say PS5 is xxxTF, and then every insider will say "Yup, that site's spec analysis is correct at xxxTF and I heard that too months ago, but couldn't tell"
And if it happens that the 9.2TF is correct after all despite being claimed as outdated or fake data, they'll say that their sources told them it was 11-12TF and lied.
Just watch.