Nope it's true .
The day prior to the game and before any violence occurred "
"While the evening passed relatively peacefully, police monitored aggressive messages on social media and messaging apps threatening Maccabi supporters, according to the report from the group of officials known as the triangle — Amsterdam Mayor Femke Halsema; René de Beukelaer, the city’s chief prosecutor; and Police Chief Peter Holla.
https://www.nbcnews.com/news/world/violence-surrounding-soccer-match-israeli-dutch-teams-unfolded-rcna179572
Posted a day prior to the game online .
"Maccabi openly supports war crimes and genocide in Gaza. (...) Ask yourself, are you physically and mentally prepared to take on a crowd of hooligans? Staying at home does not make you any less of an activist.