The province and the city are not short of PR consultants, so I don't understand their media strategy. They could get ahead of the story before opening Line 6, and now Line 5, instead of reacting afterwards and pretending to be surprised (which makes them look either dishonest or incompetent).
Why not open Line 5 now (or even back in December) with a message, repeated many times so it's not missed by anybody, that the line will be running slow for several months, after which the accumulated experience with operations will make it possible to run at the target speed.
What we get instead is overpromise and underdeliver, a recipe for PR disaster.