No. The point is, you could be downloading a corrupted copy of the firmware with exploits, for example. If your firmware has such exploits, what good is the fact that most of your traffic goes over https?
Not to side with him, but I think what GP was trying to say is that exploit on router firmware doesn't necessarily mean that your computer will get owned too - which is true. However owning a router makes further attacks much easier. Also, owning a router is advantageous for attacker in itself.