From the same article:
The attack bears similarities to the assassination of the former Hezbollah leader, Hassan Nasrallah, in Beirut last December.
If confirmed, the killing would mark the IDF’s first major success in terms of taking out the terror group’s top military commanders since the ceasefire fell apart two months ago.
Sinwar, 49, took over the command of Hamas in Gaza after his older brother, Yahya, the architect of the October 7 attack, was killed by Israeli troops last October.
If the younger Sinwar has been killed, it would leave Hamas without a recognised military leader in Gaza.
The IDF did not confirm whether Sinwar had been killed. The military said it had targeted Hamas operatives in an underground command centre belonging to the terror group below the hospital.
https://www.telegraph.co.uk/world-news/2025/05/14/israel-assassinates-hamas-leader-sinwar-resist-hostage-deal/