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First, this seems to be three years old. Second, he is one of the contributors to HA, HA was originally started by Paulus Schoutsen who is still an active contributor.

Depends of your view of a long history I guess, I worked with OSX 10.5 for a few years, every time I wanted to install something I had to update the OS first.

It could be shrinking, I usually mud it, let it dry and then mud again to prevent this.

It will be technically a bit more challenging, but I don’t think you need to use the lantern power monitor software with the device. The device seems to be built around two MCP3008 IC’s, which are basic 8 channel analog to digital converters. The values from these can be read and processed (like, sent to home assistant) using a python script on the raspberry. This is the kind of minimal programming effort someone with no experience could do using chatgpt.

I would try removing the caulking around the shower pan and redo it. If that doesn’t fix it, basically I would rebuild the whole shower. It looks like water might flow beneath the flooring here, which might cause a lot of problems in the future.

Also, I cant see it well in your pictures, but I’ve found in past remodelling projects that the best way to make showers leak free, is to first place the shower pan and then do the wall tiles, so the tiles are slightly above the pan.