A declaration is an opinion. Unless I had inside knowledge, which I do not, they are still opinions. I didn't claim to have sources otherwise, which just makes them strong opinions. And you know this too.
Is it possible that was the reason? I guess, but I find it incredibly unlikely. I stated why multiple times. If I were a betting man, I'd bet everything I had that some random no-name's tweet had anything to do with it and that quickly. His tweet may have even come after Colin got the email. But even if not, I doubt within a couple hours a major decision like that would have been made and an email sent. It likely wouldn't have happened until the following day at the earliest.
"Definitely politically motivated" is not an opinion. You have presented it as a fact. The key word there being "definitely."
"but I guarantee people in the industry who don't like him complained and that's why."
Nothing in this sentence is presented as an opinion. You are "guaranteeing" people in the industry complained about him. You have no idea whether they did or not.
"I didn't claim to have sources otherwise, which just makes them strong opinions. And you know this too."
None of this has anything to do with you declaring that this event was "definitely politically motivated" or guaranteeing that people in the industry reported him. You didn't present "strong opinions." You posted declarations as fact. Unfortunately you either don't know this or, worse, you do know it and are just scrabbling around looking for a loophole to crawl out of.
So you'd be willing to bet that this organisation cancelled a panel because some industry insiders don't like him? Again, given that his political views have been widely known for some years now and he hasn't done anything recently that is unusual or caused controversy. Why would this organisation suddenly decide to start listening to these industry insiders a few days before he was due to attend?