Canon USA has made an official statement and it has been published on PetaPixel about rumored shipping delays for the Canon EOS R5, they do not touch on concerns about the performance of the EOS R5.
From Canon USA:
Orders of the EOS R5 are scheduled to be delivered as initially stated at launch. The first set of cameras shipped from our warehouses this week. We eagerly await the content that will be produced by talented creatives using this camera to be shared with the world.
That’s it, that’s all.
I think it’s best if I just let each individual translate this official statement from Canon for themselves.