Sure, it's not all over the world, it's only in a major part of the Setting...
And regarding a wasteland: So any cyber-Chars currently playing there need to get a retroactive buttpull to be somewhere else during the critical time as to not end up as cripples and we end up with huge areas where playing anything tech oriented is quite realistically not feasible.
So, everything got (as in past tense) fried.
Great.
So, everyone living in the affected areas needs new vehicles, all technical convenience (waste disposal, communication, food processing, medical equipment, etc pp) is broken, but nobody can really earn any money to replace it and also has proper difficulty to access any existing digital funds.
So, going there, for a run as somebody from elsewhere, you might still have your whizz gear.
But then what?
Basically nothing to interact with as a Decker, because outside of milspec EMP hardened facilities, all interaction devices are dead and/or sensibly usually not yet replaced.
Oh, maybe you are a rigger? Great, then all your usually not that attention-gathering small drones stick out like a clown at a funeral, because all the common place drones in the environment are gone.
Same if you are the vehicle guy.
Your inconspicuous "Cletus and Co, Handyman's Service" Van to get your team around in secret is suddenly not so secret anymore because it's one of maybe 5 working Vehicles in a 5 mile radius.
And if one of your precious toys gets damaged? Oh golly, have fun finding someone to get replacement parts from, without a margin to reflect "hey I'm the only guy in the whole city who can fix your Flying Eye.
Having obvious Cyber in working condition also sure sounds like fun now.
"Look, this guy has cybereyes, he obviously is from outside and probably up to no good, all eyes on him"
Really sounds like a massive amount of enjoyable play to be had..
Meanwhile Mike Magick doesn't have to give a flying Soyfry, because lolmagic and can have a day of endless party, because who would bother him now if he does more flashy illegal stuff?
Security without license scanners, vehicles and few guns, in a country where thanks to the return to caseless ammo as a default, not even the industrial production of ammunition nis feasible anymore after an EMP?
Generally Muggles with sticks and stones?
If you want to play in this setting, you basically have to turn the wheel forward enough to have remedies for all the broken environment in place, thus basically nullifying all the changes, or have awakened be given an even more favorable playing field that properly screws all tech focused chars due to the lack (or severely taxed with additional hassle) of interactions in-game.
Sure, if awakened-only is your preferred playstyle, that might be fine, but there are also us players who don't enjoy being a partymember of "Gandalf and his useless Cyberhobbits".
As is said, this is not a well thought-out setting, quite the contrary. It looks like me as it's suffering from the "bigger, louder, farther"-syndrome, where one adds to many supposed awe-inducing items, but pays to little time on giving thought to secondary consequences.
I mean, Bug City 3.0 + EMPing most of the relevant UCAS + army eating mystical Fog + reconquista + borderline open war between country vs Corp (and I prolly forgot something anyways) is maybe, but just maybe a tiny bit much to sensibly cram into a single book and still let it make sense somehow?
I get it, you need a "next big thing" to get people into buying setting books instead of "expanded armory N°17", but this is a bit too much of that.