Everyone is vulnerable when they aren't patched (and sometimes when they are). This particular warning only affects unpatched servers. I assume because servers, though they should be patched right away, they often aren't, because businesses (business managers) doesn't want to down the server for the patch. New technologies will allow patches even to the kernel without taking down the server. When that happens things like this will mostly disappear.
No, most reasonable people do not say that Linux is invulnerable, however, the Linux desktops and servers are far less vulnerable than almost all other operating systems.