This is interesting: British Grand Prix: F1 teams could face penalties if they visit race stewards without an invitation - BBC Sport
According to the blurb, Toto was invited but Christian Horner rushed after him uninvited! Tw*t.
I did wonder if Horner's original ranting was partly frustration with his own driver for not seeing the bigger picture and throwing away a 33 point lead when all he had to do was let Hamilton take the lead and even if he didn't retake the lead at some point with his faster car the impact of a Hamilton victory would have been minimal. But going on his continued ranting he is clearly just deluded.
Verstappen lost out in a racing incident, get over it and move on.