French is a single MFL and all students taking French at university will have French A level. This is not a good guide to the whole picture of MFL and you are correct, Surrey is not up there in destination universities for the most academic students, but obviously takes teaching French very seriously, so good for them. I have not checked, but I bet they don't want AAA to get on the course though! I suspect they would not care too much what the other A levels are or in what subjects. The quote seems to suggest that they concentrate on translation and language use for business so whether you have other high quality A levels may not matter one jot. Employers may care though.
Also, the list of destinations/further qualifications do not make it clear whether the MFL students are using their languages or not. DD is a Barrister,so 2 years of post grad courses. She has spoken French to a French client once or twice. No-one gives a whatsit that she can speak languages. They care a lot more about other attributes, that she can convert to law, and can demostrate her ability to do the job!
sendsummer - your suggestion that the universities should offer language acquisition to other students is an excellent one and some universities do offer year abroad in say Frence, and the student takes French modules whilst at university ab initio. The big problem is that students are risk averse. They doubt their ability and, let's be honest, do not think language acquistion is easy or desirable. There is little evidence so say people are recruited by major employers because they have a language. They are recruited beause they have the skils the employer wants and they just happen to have a language or two. If anyone thinks it definitely makes you more employable, it is does, if that is what the employer wants. If they are ambivalent and you are not very good in other areas, have no work experience, have not done an internship, not volunteered, etc, having a language will not get you the job. Sorry if that is hard, but it is reality. The French, Germans, Swiss, etc already here can do all of this, with knobs on! So it is best to choose a course with an end result in mind.