A blueprint reviewed by The Times laid out the attack in detail. Israeli officials dismissed it as aspirational and ignored specific warnings.
Israeli officials obtained Hamas’s battle plan for the Oct. 7 terrorist attack more than a year before it happened, documents, emails and interviews show. But Israeli military and intelligence officials dismissed the plan as aspirational, considering it too difficult for Hamas to carry out.
I suspect this is damage control - that Israel can no longer pretend that they didn't know in advance, so they have to pretend that the failure to act to prevent the attack was a mistake, rather than a considered decision made specifically so that Hamas would provide them with an excuse to invade and occupy Gaza.
Like "Remember the Maine". For those who forgot "The Maine", it was a US Navy ship that sunk in Havana's harbor, contributing to the Spanish American War.
Most investigations (both modern and contemporary) have determined the explosion was an accident, but it was still used to justify going to war with Spain.