I'm partial to the avalanche
There is a similar circuit utilizing a zener diode (https://www.edn.com/design/analog/4420926/White-noise-source...). This is very flat white noise and very wide band and works quite well (had it breadboarded a year ago).
In your link they supply it from a battery, but if you want this as a RNG for a computer you aren't going to want a battery...
You can use a regulator to supply it but the noise from the regulator will be a critical consideration since the noise from the regulator may be predictable to an outside observer. So that deserves a careful design.
This sort of design seems simpler to get right at least electronics wise, https://github.com/waywardgeek/infnoise but OTOH the underlying noise process is a lot less clear than a zener, and I would worry that it's picking up external RF.