Video's like that make me chuckle..
There are two things that untrained people should never mess with.. 1) Electricty and 2) Explosives.
A microwave may provide enough attenuation to block a signal going to a cell phone but it won't come remotely close to blocking an NEMP (nuclear emp).. Comparing a cell phone signal to an NEMP (E1 Pulse), is like calling an apple tree a fruit store. Its such a ridiculous video that it boarders on engineering comedy for those who understand electromagnetic wave propagation..
Trust me, your microwave won't stop an E1 pulse from a high altitude nuclear detonation any better than your screen door will stop a cement truck.
Again with the cell phones! Stop it! Cell phones process signals that are measured in millivolts and microvolts! That is .0001 volts! When a nuclear bomb is detonated in space, the gamma rays it produces knock electrons from the atoms in our atmosphere.. Its a process called "compton scattering" or "the compton effect".. Those electrons then flow to earth with an electrical potential that can reach as high as 50,000 volts per meter.. Using a cell phone signal as a comparison is like using a 9 volt battery to prove something is lightening proof.. its a joke!nice one doc, I just put my wifes I5S in a metal biscuit tin lined with bubble wrap and a tight fitting equally metal lid and tried phoning it, the tin sucessfully blocked the signal. Make be worthwhile doing some experiments with other sealable metal containers perhaps in combination with foil coated mylar bags as well???
You don't have to spend thousands to protect your electronics.. Simple put them behind multiple layers of metal that are insulated from each other. Put your electronics in a high quality static shield bag (seal it up), then put that bag into another bag, then put those bags into a trash can with a cardboard liner and tape the entire thing shut with a conductive tape. No gaps, no holes.. Make it air tight. Then put it in your basement.
That will protect 95% of your electronics from 95% of EMP pulses.