It’s an interesting video, you can see the sizes and form factor of the recievers this way much better. You can still skip the parts you are not interested in.

The quick start guide from the link in the description if you just want to read numbers: https://static1.squarespace.com/static/669856991b982007b8a6a788/t/67af70bd5fc318472e2f9f1a/1739550910959/Evaluation+Kit+-+Quick+Start+Guide.pdf

No.

A developer kit is available, but only for R&D teams: https://www.etherdyne.net/evalkit

The alternative is death, so a lot people would choose this instead.