It's tricky because some effects are for him and others are for the combat.
So for example if a unit of knights charge him in a block of saurus I'm sure they'd lose their +2 lance strength against him.
The uncertainty comes whether they'd lose their +2 strength against other saurus (as they can't hide behind his shield).
However they would normally gain +1 combat resolution for the charge... would they also lose this?
Personally we say they don't get any benefit, no +2 strength (regardless of who they're fighting) and they lose their combat resolution bonus.