You are correct. I don't know why I tried to make a starter out of the Lallemand aromatic yeast.
It's because you didn't want to pay premium pricing for the Lallemand yeast. If your starter worked, you would have free Lallemand aromatic yeast for life!
Maybe it does not follow a "typical" starter fermentation schedule, but that doesn't mean it will never work. You mentioned it looked good the night before, so maybe it just needs less time to ferment compared to other starters. I'm a bit surprised you're giving up so easily