I stopped paying attention when I read this.
Pi-Hole is an ad blocker and it is fit for that purpose. No argument from me. However, to give this advice to people for whom device and network security is not a major or even minor concern is frankly dangerous.
Buy an iPhone. Buy a Mac. Keep your Windows PCs updated. Get a mesh WiFi solution that takes care of firmware patches automatically. Run a browser-based blocker that updates in the background without interaction.
These are the low-hanging fruit that should be done long before you are trying to set up what is essentially MITM-as-an-appliance without any paid support or guarantee.
Who is this article actually helping?