Check out this primo 
On March 12, Israeli Prime Minister Benjamin Netanyahu gave his first press conference since the U.S. and Israel first attacked Iran. Some social media users doubted the authenticity of the video address, and led them to question whether Netanyahu was still alive.
In the image, Netanyahu is pointing with both hands, and social media users said his right hand appears to have six fingers.
But upon closer look at the video, Netanyahu’s hands looked normal. A trick of light likely made part of his palm appear to be an extra finger.
Gonna use this one at the bank. "It might initially look like I owe you guys $100.000, but upon closer look you will realise that is merely a trick of the light.
He gestured with his hands a lot and no irregularities appeared.
No irregularities appeared, which is why people observed irregularities.
His right hand (viewers left) does weird stuff and has artifacts the other hand doesn't a couple of times. From 5:28 in the briefing: 
A video of Netanyahu’s press conference doesn’t prove he is dead. We rate this claim Pants on Fire!
They must hire people directly from reddit to write for them. This is the most basic bad-faith smuglord trick in the book. The claim isn't that the video proves he's dead, the claim is it looks like he has an extra finger, which it does.
Anyway you can also just watch the press briefing itself, if you want to harm yourself for some reason - youtube
I am sorry to say it, but you are staring at a shittily compressed video that crunched frames together. That is all this is.
edit: I want to make it clear as well that I do hope I am wrong and he was pasted. Turned into rancid, chunky salsa. So if y'all turn out to be right, good on ya! :)
I am not saying it's anything other than that. I don't know what is going on, but I do know that the video has some weird artifacts, which could be anything - probably just compression. However the "fact check" isn't then to say "actually there is no weird digital artifacts going on", because that's just denying reality, which is why I've put this in slop. It's funny.
Devil's advocate: any cell phone can take a better quality video than this. The only reason it's so compressed was an attempt to obfuscate AI artifacts.
When video is uploaded to or streamed through sites like youtube it gets reprocessed and recompressed, often with dynamic bitrates and other shit that can make images unstable.
I watched multiple high-res videos where he had 6 fingers within the first minute.
Moreover, while he was moving his hands - the 6 fingers appeared at a point where he had briefly stopped moving them.
I dunno these don't look like any compression artifacts I've ever seen, maybe newer compression algorithms legit work like this and introduce different kinds of artifacts than before, I admit I haven't been keeping up with this stuff.
What I'm used to seeing in compression artifacts is small features in the video (i.e. fingers, teeth) get mushed together with bordering features and weird pixels popping up around them, I've never seen a compression algorithm hallucinate extra fingers or remove teeth.