I think they could use both types of a/c.
I thought these ships were getting the same type of catapults as the new Ford class carriers. Have seen illustrations with one on the angle deck and one on the foredeck in the pictures.
Following the 2010 Strategic Defence Review, the Government decided to convert them to a ‘cats and traps’ configuration and buy F35Cs instead. However, BAe Systems (who are rather more heavily invested in the F35B) suggested that it would cost a lot more to convert them to Cats and Traps and would lead to years of delays.
So the Government made a U-turn and cancelled the plans to fit them with Cats and Traps, despite the USN apparently begging the British Government to have them fitted so that the Carriers were interoperable with their aircraft. BAe Systems were of course delighted by the U-turn, and I’m sure the USMC were as well, the USN and RN were less so...