Artemis might use a swipe gesture to visually hint at the relation between upvoting and boosting, as shown in the main animation. Here’s a static app mockup with both swipe levels displayed. I’d also imagine that there should be a setting that auto-upvotes posts when boosting.
You’re probably right, but the current iteration seems misleading to me as well. I just feel like there should be some way to make voting more coherent in general.