Will sleeved cable touching back of mobo damage components?

Hey everyone. I’m replacing my motherboard for my new build, and I was routing my cables through the back of my case this morning to make things easier when the mobo comes. One of the black sleeved cables would be touching the back of my mobo from behind the opening in the back of the case.

- why is there an opening there, it’s right under the CPU so is it for heat?
- if the sleeved cable is touching it will it short out anything? Do I have to reroute the cable?

Thanks?