I should point out that personally, as someone who's been following PDP on and off over the years, I was getting really annoyed with all the jew jokes. If that means he'll stop doing them from now on then great. And I'm glad those jokes came back to bite him in the ass, he should learn to deal with it.
Now with that said, when I first saw the Fiver video with the infamous sign, I laughed so hard, it was so ridiculous. Like, PewDiePie videos aren't what I would call refined or clever, but the comedic timing on this particular video was so good. He spends the first part of it asking people to do random shit, and then goes to sleep. The second part of the video is the next day, and he forgot most of what he said and just look at what people actually did. Then the two guys appear, and you along with him are wondering "oh boy, what did he ask these guys again?" and here it comes. The constrast is so disarming, it took me by surprise. And then the "subscribe to Keemstar" to seal the deal.
Ultimately it is a very juvenile and offensive joke that toys with antisemitism, the very thing I was annoyed with him. But that timing, that context, at the time I just laughed. Ironically, one of the rare time PDP actually struck me as an actual good comic.