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You don't... heat it? Egg yolks change their role in ice cream when heated, increasing their emulsifying power and creating a richer ice cream.

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An immersion blender like the Vitamix heats as it blends because of high friction, on high settings. I make soup with mine.

https://www.vitamix.com/us/en_us/what-you-can-make/hot-soups

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.

OP didn't say they blended until it was cooked to custard. It's a non-trivial step you added.

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