Have you considered Hamas aren't the most reliable source of information over how many tunnels they have?
This is all very 2002. We heard endlessly about Osama bin Laden's incredible tunnel complex that would make Bond villains jealous of his lair and it turned out they were a few damp surface level caves in the mountains.
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There's a reason Hamas attacked by driving a bulldozer through a security checkpoint and not by sneaking into Israel via their secret death tunnels.
It's also particularly unbelieveable that the IDF had no idea what was going on 3 weeks ago, but now knows everything about Hamas' super secret tunnel network and can bomb it to smithereens.