So he's broadly saying external drives running the same games are both faster than PS4, which will be the CPU boost improving game loads. Interestingly, just earlier (23:01) he says RDR2 loads in 39 seconds for him on PS5, which is almost a third faster than GameSpot reported.
As I asked in an earlier post, what versions of the game and firmware are these people running? Because they will likely explain the different times people are getting, especially when running off the NVME drive. External drives, and the interfaces they use, will all introduce even more variations in load speed as noted by Richard in the
DF article linked above, compared a no-name Amazon adaptor vs a Sabrent adaptor.
Conclusion:
I don't think anybody is forming a conclusion about the I/O systems of nextgen consoles based on b/c game load times; people are interested because they will be playing those games.
Spider-Man loading in a few seconds speaks for itself.