Not being called out on it is relevant as international law is not like municipal law, its essentially a lose collection of agreements and established norms of behaviour between states and therefore if a state does something that most other states accept as reasonable behaviour in the circumstances, that essentially says the action is "legal" in international law.
Although in the 1981 strike they were called out on it.
As to no such threat existing - you can't say that as you are not privy to the relevant information. Legal opinion from an international law expert:
Israel's strikes appear to meet the proportionality test in international law, the necessary test is essentially TBC: