Today there was a question in the MOSC about the EM Prerequisite Kit OEM24ai and the errors and warnings that are issued.
See here: https://community.oracle.com/mosc/discussion/comment/17043737
The questioner had the problem that the EM Prerequisite Kit was checking the kernel version of the operating system. This is a normal and necessary check. However the Kit found a version 4.x, but the Kit checked for version 5.x.
I tried to help, but could only do so partially.
My recommendation was to open an SR, because either in the documentation of OEM24ai nor on MOS there was any information about the necessary kernel version.
In the morning the questioner (thanks to Charles M) had opened an SR at MOS and got the answer, that this is a bug.
So, if you get the same error, when you use the the EM Prerequisite Kit, you can ignore this error.
Maybe the same error occurs when you install OEM, because the same checks were made during installation. So, I think you can than ignore that there, too.
Good luck!