Because recently Intel's meltdown got a lot of attention, especially when the fixes do cause a slow down. You may not notice it, but people running expensive servers certainly did. This made Intel look like a dancing clown who wasn't putting any effort into security. AMD though was actually the least effected among all the CPU's out there. It was Google who found the flaws, not someone with a green screen and stock images.
This is just trying to attack AMD with extremely questionable claims. Not that there aren't bugs on the CPU, but that you needed root access to use them. Which if someone has root access, you have bigger concerns than the CPU bugs. Meltdown is far worse as you have the ability to read memory that you don't have permission.