To start with, it's the way the zones are drawn up. There are four ridings in P.E.I. and one of them was never touched. That affects all of the other three. The riding that wasn't affected was held by a member of the previous government. Her riding was left intact as rural, and the way they drew the straight lines impacted every other riding on the island.
On March 9th, 2021. See this statement in context.