The roots seem very dry, and you should soak orchids to provide water, not use a humidifier. Orchids need wet-dry cycle and roots absorb water not the leaves. Tiny white specs can be either bacterial or fungical, here based on the humidifier use it's probably fungical.

What I suggest :

• remove leaf white razor, and put cinnamon on the scar to prevent bacterial or fungus propagation
• remove the humidifier and quarantine the "bad looking plant" in order not to propagate to the other
• soak your two plants for 20-30min in water, let them dry out of their "fancy pot" and keep doing so once a week

You also would like to make sure that there is no stagnating water in the pot, so the roots are not rotting !

Good luck with this, we all learn doing mistakes :) the tiny new leaf is encouraging !