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Snow tires are prone to hydroplaning in the rain
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False.
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Snow tires are only ideal for powdery snow conditions, not ideal for icy roads
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False. (Although I say that under the assumption that we're speaking of a modern-day (1990+) "winter" tire. The kind of tire given the three-peak mountain snowflake designation on passenger cars and trucks.)
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Very costly as we would need to keep inventory for the entire fleet for just a few days out of the year. Very time consuming to change all the tires, and snow tires need to be replaced more frequently because the rubber is softer
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True, scheduling a full fleet tire swap twice a year would be an increase in labour. The initial cost of buying a full second set of tires for each bus would slowly be recovered in the need to not replace the 'summer' tires as often. Not sure how many years one expects to get out of a commercial winter tire, so they may not last as long as the equivalent commercial "all season" tire.
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Vancouver snow is typically very wet and will often plug up the tread on winter tires resulting in reduced traction.
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Misleading statement. Winter tires often look "plugged up", but this doesn't account for the way sipes allow the tire tread to change as the tire rotates, which opens up more surface area, and where the bulk of the traction comes from. Not to mention centrifugal force naturally clears the tire tread of snow and water. That's why snow builds up behind the tire on your car, and why the MVA requires fenders and mudflaps.
...mind you, I wouldn't expect the majority of transit users to know, or care, about any of these false statements.