From what I understand he's a generally good person, albeit one that's going through a creative and identity crisis and who tends to steamroll through the subtleties of what's an acceptable edgy joke and what's too far.
For a year or so now he seems to have been (unsuccessfully) trying to distance himself from his former kid-friendly, screams-at-vidya-games persona. I imagine this includes trying to garner an audience of older (at least, older than 14) people, or whoever enjoys Filthy Frank style content.
He's shown several times that he holds a lot of resentment towards different groups who try to mould him into roles he doesn't want (the media as misunderstanding him, his OG fans who want him to continue making Amnesia videos forever, etc). Right now he seems to feel like his current identity is Filthy Frank, except he's a lot more mainstream than him and as such can't get away with nearly as much.
Going back to the video in question, I absolutely do not think that he meant any harm in what he did. He just had very very poor judgement and allowed a knee jerk idea of "lol what if I asked them to write death to all jews would they do it OMG THEY DID LOL".
He seems like he feels remorse, and I don't think he deserves the vitriol from the community he's getting, but I do find it completely fair for companies to pull their support from him. Whether or not he was sincere in his antisemitism (which again, I absolutely don't think he was), I as a brand manager would not want an influencer who in part represents my brand displaying such a lack of good judgement.