Well, if you read on to sub para (c) it actually says “...at that meeting so permit, before or at a later meeting fixed by the council...”
What this means therefore is, yes, the person elected to be the chair must be present at the meeting where the election takes place, but no, the declaration of acceptance of office does NOT have to occur at the same time. It ‘can’ perhaps one might even say ‘should’ (where practicable) but it doesn’t HAVE to.
It is simply NOT the case that the election is voided if acceptance of office is not affirmed at the same time / place as the election itself.
The context of the whole of the reference, rather than an small part of it in isolation is the key here.