You should absolutely be commended for asking entirely appropriate questions in relation to a financial commitment you are being asked to vote on.
From observation of the clip (which wasn’t an easy watch / listen) your clerk presented an aggressive, unprofessional and wholly inappropriate account of them self. That they were unprepared to answer wholly appropriate, detailed questions in relation to the proposal reflects very poorly, perhaps accurately, upon their lack of preparation for the proposal. Your questions were not only entirely reasonable, they were properly considered and balanced in presentation.
In your position, having been called to speak by the chair, to be interrupted, repeatedly and so aggressively, by the clerk would properly justify a point of order - only 1 person may speak at a time and each speaker must be called to speak by the chair (check your own SOs for exact detail) - however, given the observable lack of presence from the chair, it is thought unlikely that they would find the clerk’s behaviour inappropriate.
You stick to your guns! It is your DUTY to properly satisfy yourself of due diligence.
In my opinion it is the remainder of the [silent] council, the aggressive clerk and the impotent chair that should be navel gazing.