Hmmm, I'm not seeing that implication at all.
- Morde's issue was "prioritizing dragons or playing around a slow juggernaut", not which supports he can work with.
- Yasuo's issue was that "his primary, and most popular, role has always been mid which has meant his balance adjustments always prioritize his health in that role". Also not related to which support champs he works with.
Nilah has this additional piece of prospective feedback (she might only work with some types of supports) that they're addressing. That's not meant to double as feedback on Morde or Yasuo.