Yh ofc I agree. Main issue is only, a holistic approach from UCL may still rule out ppl with under req grades, unless the reference states that are actively high achievers or sat AS (which is more uncommon now) if it is the case of misinflated predictions. And I dont think many places will show you your reference before sending, which also in turn makes it less likely as whilst I believe Admissions Tutors will be their best to be as fair and contextually accurate as possible, its just improbably for them to access their "nearly 80,000 applications for our undergraduate programmes."(yes ik thats in total not per course) in a manner that gives someone under the min req a chance. If anything, due to UCL global standings, they may even be more likely to be more considerate towards higher achievers, as most will be predicted/achieved highly so differentiating between those candidates makes it less likely for someone under to get a place.
Again this is not to say someone with lower prediction has never gotten an offer in place of someone with higher (clearly showing contextual consideration), and ofc OP (idk if tsr uses that) should have an aspirational of UCL, but they did say on their website "Due to the high number of applications and level of competition, it is very unlikely that we will make an offer to a student with predicted grades below our entry requirements." Very unlikely is not a no, but could also be hinting at the contextual students or people with key extenuating circumstances.
If unis had the management and perfect knowledge of each schools contextual situation to give as close to a fair judgement as can be then the world would be a bit better. but its not and we dont know "OP's" situation other than predicted.