For underground bunkers, the GBU-28 is the munition of choice.
The F-15I Ra'am is certainly capable of employing GBU-28s.
NY Times reports:
“video, published Saturday on the Israeli military’s official Telegram channel with the caption “Israeli Air Force Fighter Jets Involved in the Elimination of Hassan Nasrallah and Hezbollah’s Central Headquarters in Lebanon,” shows at least eight planes in a row armed with 2,000-pound bombs. Some are too far away to clearly identify the exact model, but the closer planes are seen armed with BLU-109 bombs.”...
“A New York Times analysis of verified videos, photos and satellite imagery showed that the attack destroyed at least four apartment buildings that were each at least seven stories tall.
Two senior Israeli defense officials told The Times that more than 80 bombs were dropped over a period of several minutes to kill Mr. Nasrallah, but did not confirm the type of munitions used.”