The club did ask the fans not to go on the pitch. Nobody can argue that point.
But the evidence posted from videos and pictures shows the club knew the pitch invasion would happen, so rather than try and stop it, they decided to contain it with Police protecting the away end and stewards forming a double line in-front of the players tunnel and around the SS goal. That isn’t stopping a pitch invasion, that’s managing and containing a pitch invasion. In my opinion the club took the right decision and handled a short pitch invasion lasting 10-15 minutes long, very well. This time all the fans came off the pitch and went back to their seats without any trouble. Pep, the players and the staff then came on to pitch and the trophy presentation began.