This is not Vipassana. This is Samatha (aka concentration meditation).
Samatha is often used as prep for Vipassana (achieving access concentration or whatever) and sometimes Samatha is anonymously conflated with Vipassana (because Vipassana is the important part), but no, what the author describes is not Vipassana.
This is Samatha. Totally different.
Whilst it isn't totally different, it is certainly Samatha, which as you mentioned, is used as a prep for Vipassana. If the reader looks up the longer version of the Sam Harris guided meditation, this will cover the full experience.
Whilst this guide and the shorter video are sufficient for mindfulness, it does not cover the complete path to the complete state.
it's totally different