I don't really love this video or this YouTuber, but:
A few years ago I heard that the wisdom was direct airport->downtown links might seem like a good idea when you're traveling and visiting a new city as a tourist, but are not worth the money as they don't do much for the city itself. But now we have 3 Canadian cities with airport rail links, and urbanism/planning enthusiasts like this guy
I have worked in the transit industry in a couple of cities on a bunch of projects, so I am not sure I'd label myself a "planning enthusiast".
calling for an Edmonton light rail expansion to its airport, of all things.
As for Calgary, I thought the people mover plan was more advanced than he seems to be saying in the video. I also don't think it's such a terrible idea. Direct blue/green line service to the airport would be more expensive, and also cut into service frequency on the other branches of those lines. Finally he doesn't really explain why he thinks Calgary is dropping the ball on LRT planning compared to Edmonton. I get that the green line has had setbacks, but when it's done it won't be less useful than Edmonton's new Valley line, and the stub NW extension they're building.
Having a connection to the airport lets you serve a major suburban job centre, and concentration, and use counterpeak capacity which tends to exist in spades. In London for example many ride the Tube out to Heathrow in the morning and take a bus to their final destination, be it in logistics, maintenance, etc. Especially in the case of Edmonton an almost entirely greenfield build should be extremely low cost.
The people mover is one option that has been kicked around, things are being studied in more detail right now. Direct Blue or Green line service should not be all that expensive, the airport has lots of space for maneuvering, and the tunnel under the east runway has the room and a people mover will require its own operations and maintenance facility as well as full grade separation.
I say Calgary is dropping the ball because while Edmonton has just opened half the Valley line and is flying along with the west leg, as well as just opening the Blatchford extension, there is also quite advanced planning going on on the southern extension, and the further northern extension towards St. A. Meanwhile in Calgary the high floor network doesn't have any extensions at an advanced level of study and half of the Green Line is all that's currently on the move - thats a big gap that should be closed, especially with the firehose of money being spent on transit in Canada right now. TLDR: Edmonton is just building way more stuff, and yes they have a smaller network, but Calgary could also be building a bunch of useful stuff!
Denver light rail comes right up to the terminal too. Integrated as well as the best European examples
Denvers connection is one of their new "commuter" rail lines, which runs on high voltage 25kV AC overhead lines and has high floor cars of the same model used in Philly. This line is quite high speed and high capacity compared to Denver's rather "meh" light rail which is a big network but with frequencies as low as half hourly and a small fraction of the ridership of Calgary.
That being said I concur that the integration at the airport is very nice.