All of it. My post is 102 on this thread for the correct info, or see any of Ckolher's posts.
Fact, based on what though?
Your personal experience of the console? Because if it isn't - it isn't a fact because the quotes we have on this subject an be interpreted in multiple ways or use technical terms that can be operated in different ways.
In Cerny's quote we have him explaining how you download/install whatever data is required to get the game running and then in the background additional data is moved to the hard drive from the disc or your download.
Shu's quote is telling the questioner asking about if full installs are required that it is "not install", and mentions it is a cache.
Now, Cerny never mentions if the data from Blu-ray is permanent - in other words it installs in the background. So it is very possible that Cerny is saying you have the mandatory install at the start and once that is done and additional data is going onto the hard drive in the background, but into the cache area.
So as a possibility it in no way contradicts what Shu is saying, in that data is cached - not installed.
Therefore I see no reason anywhere that what you claim is a fact.
In both cases - installing and caching, all data would be moved to the hard drive. However the difference is that with installing you have to manually delete that data once you're done with it.
With caching, you do not. Depending on how they cache it will either remove old data as the cache becomes full or after the session is finished but however it is cached, everything is done automatically without you intervening. The only remaining data for the game on your hard drive would be the initial mandatory install to get the game up and running.
This method allows you to have many more games installed on your system at any one time - and makes the most logical sense if the priority is to allow that.
Of course, it does not mean that they have done that.
