It's an interesting question, because although A-levels are 'level 3', I can't find any information on AS grades... But GCSEs and the such are 'level 2'.
It does sound like they want 2 A-levels though. It'd probably be a lot safer just to contact them. Check the course requirements too, as it might say if they accept AS levels. Generally though, they don't. They'll either say '260 points from subjects' or '260 points from A levels'. This sounds like the latter.
But you'll never know unless you contact them. Hell, try making an offer with them. I was able to get my firm choice to consider me with 3 A levels and an AS, even though they want that AS as an A-level, and the other university made me an offer with an A-level, and I was able to ask if I could just achieve a AS level of similar UCAS tariff instead. Both worked.