Buried? Deep down? The fourth paragraph, clearly labeled "Affected Systems", a minute or two into the read.
They knew what they were doing by not including "VIA C3 CPUs" before the fourth paragraph. Come on. It should have been in the title.
Imagine getting a letter "High Risk of Cancer" and getting all the way to the 4th paragraph to see it's just relevant to a race of blue aliens...
Opening with the title "hardware backdoors in x86 CPUs" is quite misleading, though.