They were suspended from youtube because they regularly reported anti-vaccine nonsense which is not evidence based.
A particular trope was reporting VAERS/yellow card data incorrectly - it is a surveillance used to flag events that are occuring at an unusually high rate. You cannot assume each individual event is causal. This is very very basic but a common tactic of anti-vaccine groups.
This is not censorship. People can navigate to the Uk Column website if they want to, but it is understandable that youtube don't want to host such content. As has been said many times, peddling misinformation doesn't help anyone make an informed decision regarding vaccination.