Yes. Chrome OS Flex runs beautifully on MacBook Air/Pro 2012–2015. You do not need a “skacat” build. Just use a Mac to create the USB via the Recovery Utility.
The search term is a siren song. It promises something exclusive, maybe a “better” or “unlocked” version of Google’s operating system. But the truth is far more mundane and dangerous:
Some unofficial ISOs mess with the firmware or partition table in ways that can’t be reversed without specialized equipment. Your old PC might become a permanent paperweight.