Vertical slice

In the “Indie Game Success Roadmap Course”, there is a part “#19. Tuning Not Features” the instructor talking about vertical slice.
I think he is wrong about what a vertical slice is.
He says a little bit of everything is a horizontal slice, however according to linkedin arcticle: “a portion of the entire game can be played as if it were a final game”.
What do you think? What a vertical slice is?

I found this article.

Horizontal Slicing vs Vertical Slicing.

Interesting read. What Rick said made sense I feel.

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