I looked at the vid of the Belgian guy getting stuck, and then watched the promo vid of the self-retracting needle syringe.
Then I went back to the first vid, went full-screen, and watched again. I don’t know if there’s a way to do frame by frame advance like you can on YT, but if you double-click really fast you can get close.
Stepping through the frames just after the close-up part starts, at first the syringe barrel empty of anything solid. But then, for just a few frames, what really appears to me to be a needle appears and then disappears.
My conclusion is that the guy probably got the shot from one of those VanishPoint® syringes. I could be wrong, and I sure wouldn’t put it past any govt “health minister” to try to fake it, but that’s what it looks like to me.