They have an in-house repair shop that dealt with most or all of it, and they charge the customer for the cost of the repair. From the comments the fact that they don't gouge on repairs is one reason some folks use them.
So I feel like they don't make them repairable.
It depends on their expertise
In the Reddit thread, they talked about replacing the aperture module for some of the lenses; that's just a simple swap, along with cleaning the adjacent elements.
Someone posted a video of replacing the sensor on the old 7d (https://www.youtube.com/watch?v=udonzfGdW0Y)
Seems it eventually worked for him, after several attempts to adjust the position to get correct focus, but if you read the comments on the video there are many people who've messed up their camera trying to do this.
Might be fun to try though.