The Superfish controversy was from years ago. Plus, that didn't even affect ThinkPads! This is just some tilting at windmills for the sake of it.
But wipe the SSD on the ThinkPad and install some Linux-based OS on it, and you're rocking and rolling. No weird phoning back to the mothership behaviors either. Again, I'm simply pointing out that you can be just as secure with a ThinkPad.