""Yes I accept that. I often question myself as to whether I've understood something".
In other words he often fails to understand."
thats the difference. at least hes intellectually honest, unlike tygxc. I would rather argue optimissed over tygxc any day.
Now, the coffee's been served but before I look at the given definition, I want to make a rhetorical arguments of "if you don't know what the information means, how can it be perfect or full".
If we imagine an analogy of a chess position in the form of a code which hasn't been broken. The earth's being attacked by Martians and we're able to pick up the coded message. But how have we got perfect information if we don't know what it means?
So similarly, a complex chess position. It may be a win for either side or perhaps a draw. We can see the position clearly but we are not capable of determining an evaluation. It's the same thing. We have the information but it's given in a code which we can't interpret. We can see the chess position but we can't tell who's winning. We can only giess, based on rules of thumb. How is that perfect information? If I had perfect information on something, I'd expect it to be understandable.
You seem confused between information and making deductions from that information.
For example, if I give the question to you:
"How many factors does the following number have: 2748132412641276392817612648721647126498127348712742077492749274927409217498127409827154012740981275012834223895821975294281275987209412734981269461290120e487120874981264978126e49712647126497124712948219272847284712841 ?"
you have complete information about the problem. That does not mean you can solve it.
This was a great post by Elroch.

Usually Dio is the best at interfering with O's trolling.
And Fester usually the best at getting O to modify his behaviour.
Dio then followed up.
-------------------------------------
And within O's spiels - we then got this from O. That's @Optimissed.
"Yes I accept that. I often question myself as to whether I've understood something".
In other words he often fails to understand.
He would rather try to make it as about credentials and personalization and even his family. Constantly.
This time - he was broken. They didn't let him get away with that.
And he doesn't 'question himself' often Enough!
Not nearly.