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That video is a classic example of "a little knowlege is a dangerous thing." It would be useful to know what the credentials are for the narrator/builder. What is his occupation or level of useful technical education? e.g. physics, chemistry, electroncs, math, etc.

I am aware of what I don't know, and question using an am/fm radio as a test of an EMP cabinet.

At a minimum, I know that a faraday cage needs to be grounded. And the range of frequencies that do damage to solid state electronics must be clearly understood, as well as the probable distance to a likely EMP pulse source.

I would spend my time better learning about the behavior of EMP and its effect on modern electronics first.

The most critical need under catastrophic conditions is portable reliable two-way communications. A healthy receiver, with no working civil transmitters is just another paperweight. I would certainly protect a few sets of those, together with a generous supply of rechargeable batteries in a proven faraday cage.

Not too many people can build a faraday cage to protect a modern automobile. Or to protect the energy grid or the gasoline supply. Even most solar panel chargers rely on "modern" EMP-sensitive electronics.