It doesn't mean his memory of the time is correct G. The differences between times remembered in many of the witness statements are vast - even though they are all talking about the same event.
He may have mis-remembered the time he arrived, but that doesn't prove he wasn't there.
Your apparent expectation that everyone should be able to remember the precise time of every move they made at any given time is totally unrealistic imo.
The human memory is notoriously fallible.
AIMHO
So he got it wrong about when he arrived?
He says;
"When I arrived at about 11.45am I was firstly able to walk into the apartment, where I introduced myself to the McCanns and told them I would do everything I could to help."
Perhaps his watch was still on Spanish time, so he left Spain at 6.45 am, not 7.45 am and arrived at 10.45 am not 11.45 am? As the PJ arrived at 10 am to take the McCanns to Portimao he still missed them, I'm afraid. He's wrong about being able to enter 5A too, and even if he had, the McCanns weren't in there, the forensic people were.