Saying Emilia doesn't love Subaru because she didn't say "I love you" is like saying Wilhelm doesn't love Theresia because he didn't say "I love you" too, which is bizarre considering the fact he didn't confess not even after they got married and had kids.
I hope that this scene will finally make all those who always claimed that Emilia doesn't understand love, is incapable of loving someone romantically, or would never confess her love to Subaru realize just how wrong they were.