Yep, you and
@GregI were right, after pushing them today for more information on the roll out it's been clarified as "No progression until re-plan" and when chasing on my street being included their response was pretty much as you put that they use PIA and would need to conduct assessments to see if the cost/benefit was there to roll out to our street.
Well, guess there was no harm in trying but looks like I am back to being at the mercy of Openreach if/when they decide to include the several streets in our local area which haven't been included because they aren't easy wins.