Maybe a mistake

M1. The Predictive Modeling Pipeline M1. Encoding of categorical variables
#1

However, be careful when applying this encoding strategy: using this integer representation leads downstream predictive models to assume that the values are ordered (0 < 1 < 2 < 3… for instance).

In the notebook above, data types are still object not integers.

#2

Could you provide the snippet of code where the data providing the data, the output of the OrdinalEncoder is still an array with object dtype?

I am almost certain that the output is always numeric.