That said, BirdnetPi is inherently prone to errors and can't be set up perfectly.

You can evaluate recognitions ex post but still will only get false positives that way. And it's work.

I think Bird Weather takes this into account somehow but I forgot how.
The numbers you see there on a given day when you look up installations in your area should be taken with a grain of salt, I guess.

BirdnetPi is really fun.
The UI is a bit clumsy but it's still really cool.

There was also another implementation - all these things, including the Merlin app on your celly, depend on the same CNNs developed at Cornell Uni (aaaaand I just read that you already seem to know that) - but I forgot the name.

Bird weather by the way is a citizen science project.
You can automatically fill it with your BirdnetPi installation.
You can also config a treshold so no human sounds get send.