Nope. It has an i7 with SSE4 so it can run Sierra. He meant that normaly people who bash them around and let them overheat kill them quickly. And even if it gets pushed out of OSX you can hack it and make it run newer OS's anyways.
(Ex: See here - https://forum.level1techs.com/t/to-hackintosh-a-macintosh-mac-pro-1-1-with-el-capitan/108587 )