Sifu has been updated to version 1.05 today by Sloclap. You can read the complete patch notes for the update from here.
Players who had pre-ordered the Deluxe Edition of the game were complaining about being unable to pre-load or download the PS4/PS5 version ahead of the launch on February 8. This was an issue with PlayStation servers and according to an official statement, this is resolved now.
The PlayStation teams have told us the early access issue is now resolved, and the game can now be downloaded! Again, we’re very sorry to all players who were hoping to play earlier today, we’ll have an exclusive gift for all Deluxe edition holders to share with you soon !