1) It's meaningless--it's almost impossible to produce a real ranking of languages on the strength of their types.
2) These dynamic languages are all unityped because they're not statically typed. The fact that runtime tags won't allow certain operations to succeed has nothing to do with types.
3) Strongly typed is a rough and ready way of saying you don't do many implicit conversions.
I sympathize with (1). (2) is accurate, but really a terminological point. There's clearly a phenomenon to talk about, even if "typed" is the wrong word. I also sympathize with (3).
Python does far fewer implicit conversions than PHP, JavaScript or Perl. It even doesn't do at least one that Java does. So people often say Python is strongly, but dynamically typed. It's a real aspect of the language that you can view as a plus or minus.