This will probably be buried because I'm too late to the party...
This website is probably just selling you the results of following a guide from a guy who goes by Michael Bazzel. He has a podcast (Privacy, Security, and OSINT show) and releases a privacy book every other year, alternating with an OSINT book. He also has good guides on his website and they sell all sorts of training.
Anyway, if you want it done right, do it yourself and know what you're getting. My understanding is that his guides are aimed at an audience significantly less technically capable than HN.
You are completely right, as we write on the website the most secure and private way to degoogle your phone is to do it yourself. The phones we sell we the pre-installed OS are more for people that are not technically able to do it themselves.
This website is probably just selling you the results of following a guide from a guy who goes by Michael Bazzel. He has a podcast (Privacy, Security, and OSINT show) and releases a privacy book every other year, alternating with an OSINT book. He also has good guides on his website and they sell all sorts of training.
Anyway, if you want it done right, do it yourself and know what you're getting. My understanding is that his guides are aimed at an audience significantly less technically capable than HN.