Telus doesn't control the content made available by broadcasters. Warner Brothers, the main owners of the Discovery series of channels, and many others, started moving a lot of content to Discovery+ a while ago. Rogers and Bell fighting it out for broadcast rights to channels made it worse. Bell lost the broadcast rights to all of US content that aired on Discovery / HGTV / Cooking Channel, etc.. Bell still owns the rights to all of the Canadian content that aired previously on Discovery / HGTV / Cooking Channel, etc..
Rogers hasn't let a single other service provider pick up the new neutered Discovery channels, etc., yet. That is Roger's / Shaw's usual behaviour in situations like this. They'll eventually let the other carriers have access to the channels and US content, but there's no saying when they'll allow it. Could be a few days. Could be a few weeks.
In the mean time Warner Bros. / Discovery is trying to get as many people to sign up for Discovery+ as possible. They're trying to make back profits lost on a number of their bad deals and acquisitions in the last year or two. The rest of the content will likely end up moving to Roger's paid streaming service, CityTV+, which Rogers did previously announce months ago. There is no easy answer right now other than to wait until Rogers finally lets others have access to the channels and content.
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