Why is Height_labels not nominal variable?

Screen Link:
https://app.dataquest.io/m/284/variables-in-statistics/4/the-nominal-scale
Here, it doesn’t mention Height_label as nominal variable. But we can not subtract them to tell the size of the difference then why it isn’t nominal variable?

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Because we can tell the direction of the difference even if we can’t tell the size of the difference.

We can say that someone with a medium label is taller than someone with a short label. That’s the direction of the difference in this context.

The next Step goes into detail on this as well.

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