He opined, he did not say 'Fire' or something stupid.....come on get a grip on yourself.
Let's be clear about one thing he tempered his opinion with, just in case you are pontificating without actually reading what he wrote or have 'conveniently' forgotten, I quote "But also I understand that there's a spirited campaign underway here. My country is going through much the same. And ultimately, the question of whether or not the UK remains a part of the EU is a matter for British voters to decide for yourselves."
That is pretty clear.