Oh, I think we can say that without joking
Sorry, I'm jumping in a bit late in the discussion. Just for some clarifications.
Some in Paris like to say that "Principal" equals "Premier danseur". It is just a Bla Bla Bla.
In reality: Étoile = Principal, Premier danseur / Première danseuse = First soloist.
When you're a Premier danseur/Première danseuse, you only have one certainty: you will never go back to the corps de ballet. But you have no certainty of dancing lead roles. You are "remplaçant" for the lead roles and you dance supporting roles: Hilarion, the Queen of the Dryads, Myrtha, Gamzatti, Lescaut (some Étoiles can dance these last three roles as well), Effie, the three Shades, the pas de trois from Swan Lake or Paquita, Kitri's two friends, the equivalent of soloist roles (and not Principals) in Balanchine's ballets...
For me, it's really the equivalent of "First soloist."
If Marcelino was indicated as "Danseur" and not "Principal" on social media, honestly, it's just that the communication team at the Paris Opera is very bad and doesn't care about what comes from the outside. Two years ago, Alexandr Trusch was a guest. In the casting sheet, it just said "Guest Artist." The least courtesy would have been to add "Principal Dancer of the Hamburg Ballet John Neumeier" ... But well, it's the Paris Opera!