The footage picked out for, I think, the #Nova documentary doesn't really corroborate that claim. In swedish it's called Massakern på musikfestivalen, I'm not sure which name it has internationally.

It shows some indiscriminate killing, for example throwing handgrenades into rocket shelters.

Soon after October 7th there was a lot of video material circulated, claimed to be from Israel but which was really cartel snuff and similar. If you have some material you are sure isn't in this category then I'd like to see it.