The simplest explanation is misinformation and not an honest mistake or slip of the tongue?

Considering that:

1-The Israeli government is notorious for using misinformation when it fits their purposes,

2-They have fluent Arabic speakers who could’ve easily checked the evidence, and

3-There’s no way to mistake a calendar for a list of Hamas soldiers,

the answer is yes. It’s like if Russia was caught lying with faked evidence and then said “oh it was a mistake”.