I'll beg to differ for one single reason: 2026 FIFA's Men World Cup.
If the line is operational by then (which I believe it will be), tourists will be flocking to the mall using the LRT, and you can bet that they'll want people to have a good first impression, considering that they know they're Edmonton's largest tourist magnet.
Also, there is something different and rather more "glamorous" about train that I'll guess might have an impact on WEM's decision to make a decent oath between the transit centre and the mall, especially with the elevated guideway, etc... I can seriously see the mall using it to their advantage in several fronts. Busses are not modern and attractive (most people actually associate them with bad things), whereas usually trains, especially these modern, good looking low-floor LRTs usually sell a somewhat futuristic, urban, cool vibe that I can see he mall's administration wanting to double down on.
They're no Southgate or Kingsway, and their mindset is different from any other malls in Canada (and most of North America).