Hi! The reason is simple… I wrote this guide around version 2021.4, but starting on version 2022.4, the File Size integration is now available to set up from the UI. Anything being configured through the UI is saved inside /config/.storage/, and those files are automatically managed by Home Assistant itself.
Additionally, since version 2021.6, you can disable polling updates on any integration through the UI. For such cases, if you want to change the polling interval, you have to disable the built-in automatically polling and manually create an automation to force one or more entities to update.
As you can see, there were plenty of changes, and I need to update/adapt the guide to the latest HA version. I’m just lacking time to do so, as real-life stuff gets priority. To make it worse, any time I end up dedicating to my HA installation has been updating it to the latest version and trying to debug this high CPU usage issue. I still haven’t found any solution for it, and I spent many more hours than I wanted.