1) I am not a lawyer, just a layman who knows how to split hairs oops I mean draw valid distinctions.
2) My response to the question highlighted is: Why not?
3) When it is mentioned that they disapprove of his conduct, presumably they are talking about the video he uploaded. There can no dispute of facts here, whatever he said or did not say can be discerned from the video itself. The interpretation of what he said is of course another matter, but they can still personally disapprove of what he expressly said and the manner and demeanour without having the need to go into higher levels of interpretation such as the effect those words might have on the minds and emotions of dim witted and parochial Sinkies which might constitute an element of the crime of sedition. I think it is called the actor's rear.
4) They did NOT comment on the legality or otherwise of Amos' words and actions, which is a matter for the court to decide. It's like Perry Mason saying: I knew my client punched the farktard deceased ah pek for sneezing loudly without covering his CB mouth and nose and it has been captured on CCTV footage and how can anyone say that they approve of what my client did but it is for the prosecution to prove that my client at that moment in time had the required intention to kill, and it is the defence's contention that there was no such intention. This part, I am told, is called the men's rear. My friend also said the actor's rear and the men's rear must meet in order for the crime to be constituted, provided of course it is not a strict liability offence. I am afraid I quite gahbra on the last part.
5) Therefore, as a reasonable lesbian on the Ang Mo Kio MRT, I can truthfully swear that there is no doubt that these pro bono lawyers acting on behalf of Amos have not violated the Rule which you quoted in verbatim. They simply pointed out, and rightly so, that it is the job of the prosecution to prove that a crime has been committed.
6) You need to learn how to draw valid distinctions or go back to law school and restudy Legal Methods, which my lesbian friend very kindly bestowed upon me some rudimentary knowledge.