They work for now. But these and future experiments are going to start talking more to the main Test Pilot site, and will possibly break / disable themselves without that connection. Going out-of-band to install these will likely lead to sadness eventually.

Also, I think you're pointing to older demo versions of some of those add-on and not the current Test Pilot releases. We're trying to work more in the open on this stuff, so you'll likely find things like this here and there.