When Kwarteng says “some people” think the courts are biased on Brexit, he used a typical propaganda technique. Plant the seed of doubt, but don’t claim it as your own. Get the thought out there in this way is what is known in cognitive science as anchoring bias. Trump and his ilk use it all of the time as do the Russians.
For more on the techniques the Russians use, see The NY Times video “ Operation Infektion”. It is on YouTube in three 15 minute segments. These techniques will look familiar to you and you will see them again come the next elections. Anyhow note how by linking Kwarteng with Russian propaganda, I am planting the suggestion he is a Russian useful idiot in helping undermine British democracy via the attack on the judiciary. I didn’t really say that, but is how it works.
Fortunately many Brexiteers have denounced that statement. That is great if they are sincere, but the damage has already been done. How convenient! Kwarteng did the dirty work for them.