A Vitamix is not an immersion blender; an immersion blender is one you "immerse" in the thing you're blending, i.e., a stick or wand blender.
https://www.seriouseats.com/best-immersion-blenders
Wand blender don't make things hot enough to cook, so OP is indeed using raw eggs in their ice cream. Which is probably fine, it just means their ice cream isn't using a cooked custard base.