There’s no way anyone I knew, teachers or students (over 60% mature?) would back this nonsense.
There are a bunch of London colleges which historically were niche, and heavily dominated by mature and/or post-graduate (or people doing MAs without a first degree on the basis of experience) students. The obvious example is Birkbeck, but SOAS and Goldsmith are similar. They didn't, and don't, have a full range of subjects, but they were bloody good at the subjects they did have. The ones I've named happened to be validated by London, although in other parts of the country similar institutions were historically validated by the CNAA. Conservatoires. Teacher training. Jewellery and Silversmithing. Printing. Specialist places.
More recently, they have attempted to recruit a lot more 18 year olds, and to become more general universities, with their own royal charters. But most 18 year old students stay well away - they opt either for live away universities or for larger urban post-92s - and the postgraduates and the mature students aren't interested in SU wankery.
Even of the 18 year olds, a lot of them are there to do the thing the university is famous for - music and fine art at Goldsmiths, isn't it? - and similarly want little to do with the SU. They're doing top-rated courses at a place top-rated for that subject, and are too busy playing the piano, carving wood or whatever it is they are passionate about.
So Goldsmiths SU is ripe for entryism by a small clique of people interested enough to get involved, privileged enough to be able to afford to get involved, and dim enough that a poorly regarded course at a second- or third-tier university with no particular reputation for it is the best they can get onto. English at Goldsmiths? Why aren't you, well, anywhere else? But UCL, for a start off?
That's a perfect storm for entryism and stupidity.