The purpose of this CIA Harris video is for him to say that the US has defensive nukes, he says in the video that the US protects it's allies with nukes. Then he says that Russia, China, India, Pakistan, and North Korea have nukes for unknown and possibly nefarious reasons.
He doesn't mention Israel having nukes. During the sponsored, he uses "ground news" to examine whether Iran should have nuclear weapons. He says that Al Jazeera "downplays the threat" of Iran creating nukes and "casting doubt on the international narrative".
"international narrative"
Then he pulls up an Israeli news site which says that Iran has the materials to produce 10 nuclear bombs. He says that Israel news "cuts right to the chase" but is only "slightly misleading".
He mentions the Cuban missile crisis late in the video. He doesn't mention that the US deployed nukes in Turkey prior to the USSR deploying nukes in Cuba.
I think the main purpose of this video is to fear monger Iran having nukes. The video also postures that China is acquiring nukes for nefarious global control.