A lot of information is speculation, misunderstandings, and outright FUD
But WSJ are generally reputable and this lines up with a lot of what I have seen discussed in various OSINT forms. www.youtube.com/watch?v=KjhMAMAPgeM
But basically: Coordinated attack, blowing holes in walls, and successfully attacking checkpoints.
Everyone wants to paint this as a huge failure and massive incompetence by the idf. And… it is. But it is also a largely unavoidable one. Because that concrete and barbed wire wall is basically the entire “no man’s land” between Gaza and israel. And without leveling even more of Gaza (about that…), there is no real defense against that. A breach is “easy” if you are willing to sacrifice your own lives and then it is a matter of getting forces through. It won’t be enough to “take israel” but it is enough to launch terrorist attacks and even capture hostages.