The only real advantage of this seems to be the ability to disable the chime during quiet hours. Otherwise it seems like a much more failure-prone doorbell (more components means more things to break). Why not go the other way entirely? Disable the chime, install a door knocker, and never worry about replacing outdated tech, dried capacitors, shorts or anything else for the rest of one’s life.
You can know if someone rings your doorbell when you aren't there is one tangible advantage. Or you can add a remote bell if you're often working in a basement, shed etc. If you don't want to deal with maintenance then don't, but some people like to play with stuff like this. The author of this article is one of the maintainers of ESPhome and one of the biggest contributors to Home Assistant, so he definitely is the…
Would you maybe share with us how you built it/which parts you used?