The website does not seem to have been updated but the prediction security of PCG has been fully broken recently (and does not rely on the "Challenging" part of the spectrum): https://hal.inria.fr/hal-02700791/
Hence any cryptographic use of PCG is definitely prohibited
Interesting that the strongest variant took an average 20,000 CPU-hours to break- so definitely not cryptographic strength, but not a walk in the park either.
Hence any cryptographic use of PCG is definitely prohibited