Israel warns 1.1 million people to flee north Gaza within 24 hours. The UN warned this will have "devestating humanitarian consequences" and calls Israel to revoke it
While I also hold this suspicion, there is fairly little evidence of this.
However, I'd say the biggest evidence is that it was literally the 50th anniversary, down to the same holy day, of the last time Palestine forces attacked Israel. The fact that Israel didn't at least have some sort of elevated defense last Saturday is absolutely unforgivable. This is not quite a smoking gun, but definitely at least gun smoke.
There are two possibilities I see. Either Israel knew it was going to happen, and let it, or they didnt know. Both are unfathomably irresponsible, and unforgivable.
Israelis should be tearing their own government apart for their ineptitude and/or treason, and likewise, Palestinians should be tearing Hamas apart for being so stupid and impotent.
I think calling their lack of preparation for something that hasn't happened in 50 years suspicious is a stretch, regardless of whether or not there was an anniversary.
Egypt warned them days before, the USA has confirmed the warning by Egypt. Hamas has released training videos showing the paratroopers training with flying gliders. Yair Lapid released a video in September warning the government was ignoring intelligence signals.
You often see reports after a successful attack that "so-and-so warned such-and-such about this-and-that days before attack", but they almost certainly get dozens of warnings a day from lots of sources. Some are right, some are wrong. The attacker only has to be lucky once. The defender has to be lucky every time.
That's not to say that Israel won't capitalise on the chance to flatten Gaza, because I browsed /r/combatfootage and have eyes, but I think they'd rather not have hundreds of Israelis held captive and over a thousand dead.
Not like they have a lot of reasons to stay, after their land has been stolen, houses bombed, electricity cut off (killing all critical patients including premature babies), water and food supplies stopped, and 100's of children already killed.
Edit: and now getting rained on by white phosphorus (a war crime chemical weapon).