Your policy is perfectly fine (you can paste it into the CSP Evaluator to confirm) -- hashes are a good alternative to nonces, particularly in static applications.
There are two reasons why most of the advice about policies with strict-dynamic focus on nonces rather than hashes:
Applications often dynamically interpolate values inside <script> blocks ...
The articles on Windows IT Pro Center are in a hierarchical order, and it is expected that it would be unnecessary to repeat the information provided on previous levels. Your answer is three levels up:
Security policy settings
Security policy settings are rules that administrators configure on a
computer or multiple devices for the purpose of ...