You can see the tear down on the lens Rentals website. Then you could make a comment based on what's in the camera. To do a shoe upgrade, its almost certain that the entire top assembly would be replaced. That's probably going to run $300 or $400. Then, they will send the old top assembly to a subcontractor where it will be refurbished for use as a replacement part. You don't get new parts when your camera is repaired unless refurbished ones are not available.It's probably an entire hot shoe assembly that connects to some internal usb connector with a little firmware magic to make it work.
I think the discussion at Canon probably involves the amount to charge to change out the top assembly. It all is based on the cost of labor, the parts are not that expensive since the old one will be reused. They might be willing to do it for $200, after all, the moon is made of green cheese, right?

Taking Apart the Canon EOS R5 Mirrorless Camera
Let's get one thing out of the way in the first sentence. If you're here to understand the mysteries of thermal flow in the Canon R5 I can tell you everything I know without doing a teardown: It's small, it's weather-sealed, and photo-body cameras have limited ability to get heat out of the...
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