AR - agreed!
Only after the event can a MO determine - on the balance of probabilities - whether or not a non disclosable interest existed although, by then of course, it’s too late (even if the decision is sound which is by no means guaranteed)
NOBODY can ask, request, demand or direct that a single individual (especially a Cllr who is summoned to attend) then leave the room for all or part of a public (or closed if a Cllr) meeting of a council.
The test for Jacko, if similar arises again, is to decline the request and see what happens next…. Your move, check mate.