Not because it cant run them, but because apple doesn't want you using that machine anymore.
Legacy opencore patcher is proof that these machines can run the OS but the installer blocks it.
For frame of reference, I moved from using linux exclusively to MacOS around 2 years ago. I'd avoid buying real mac hardware over this because it is expensive planned obsolescence. I have a laptop running Ubuntu which is like 8 years old and still runs the most recent version just fine. How long will your mac continue to receive updates?
PS - Question for you. Why are there so many threads on the net on how to install linux on a macbook?