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Well, it's not only this one place, but all the subsequent exercises and all the runnable versions in the gh-pages branch that need to be adapted. This is why we are shying away from keeping the limits all the time adjusted to the current incidence numbers.
And why a warning says:

You might need to adjust the incidence thresholds (which are hardcoded in this code snippet)
in order to see all three colors.

Are you willing to adapt the other places as well?

To see more than one color, we need at least one of the two thresholds to be between the lowest and the highest current incidence. With incidences changing together, it's hard to achieve this for more than a few weeks.

Closing, as the updated tutorial no longer displays covid incidence numbers.