This looks to be an older plan that is not eligible for the perk. Self-serve will only show you the perks that the plan is provisioned for. This depends on what was offered when you got the plan. For example, 5G speed boost isn’t a perk being offered on current plans, but the 3-Day Easy Roam is in its place.
Are you able to see if there are any cheaper / the same price plans available for that line to switch too? As there should be a few available but with more data. The available plans would be eligible for the perk as they’re currently in market. Changing your mobility rate plan | Koodo Mobile