I have to agree that given there is only proposed and u/c, that excavation does count as construction. it is actually physical progress.
Given that Vancouver's Turn has been dormant through the last couple years, it did not count, hence being listed as "on hold." Even a tower that is half built on hold does not count as the tallest u/c for me as well (if it happens to be the tallest project).
But, as of today, we now have photo evidence of digging occurring on site again today:
So, one could argue this could be Vancouver's tallest u/c again.
This photo was taken by Jimbo604 in the Vancouver section today.