The same quote is also in the guardian article.
“They dragged little Greta [Thunberg] by her hair before our eyes, beat her, and forced her to kiss the Israeli flag. They did everything imaginable to her, as a warning to others,” the Turkish activist ErsinÇelik, a participant in the Sumud flotilla, told Anadolu news agency
But there's like 2 good cops, so it must be copaganda.