I imagine they made numerous visits to Israel because they were Jewish, just as Einstein did. Although Oppenheimer is said to have been ashamed of his Jewishness and tried to hide it, he still was a supporter of Israel and of course this meant helping their nuclear program. He met with Weizmann in 47 and Ben-Gurion in 52, literally just after the holocaust. He helped Israel as he was concerned about Egyptian-Russian relations and securing the position of the only Jewish majority state in the world in the wake of the largest industrialized genocide. Ben-Gurion recruited many Jewish scientists with the explicit goal of ensuring something like the holocaust never happened again. The french also helped newly independent Israel.

Why would this information be relevant in modern coverage of Oppenheimer and Teller? They weren't atomic spies selling secrets to an enemy state? The USSR was obviously not equivalent to Israel given the US was the first country to even recognize Israel. Post-WW2 the world was fractured into the eastern and western blocs, and obviously the USSR was the enemy. So I don't see your point

Finally, Israel's nuclear weapons policy is drastically different to that of the US or the then-USSR. The purpose is entirely defensive as Israel is a small country surrounded by majority-Muslim countries which have invaded Israel several times; Israel cannot afford to lose a war as this threatens the very existence of Jews. The US and USSR had very different, intentionally antagonistic policies with the exact opposite of deliberate ambiguity.