Earlier quoted context omitted.
That has nothing to to with EVs per se, as many modern ICE cars are just as impossible to repair for non-affiliated repair shops. And some EVs, e.g. the Nissan Leaf, are quite easy to work on for independent shops.
Except for the electronic subsystem, almost everything else in an ICE car can be repaired by a competent non-dealer mechanic shop. I do agree though that modern ICE vehicles are becoming more and more complex, with electronic subsystems replacing manual subsystems, so non-dealer mechanics may struggle with such complex work and may even reject the work saying it's out of their ambit. This situation is getting aggrava…
And then there's all the people putting Tesla drive-trains in classic cars. They couldn't do that if they weren't able to work on the electric drive.