Anyway, I agree that "Hamas said so" is one side, and it's weak. And on the other side you have the still-standing hospital. You also have Biden's statement, which I'm sure is based on the latest evidence he has access to.
But I do want to point out, that two pieces of the evidence you mention: the misfiring rocket video and the voice recordings, if they're what I think you're referring to, were both released by the Israeli government and have been disputed as well. The video had the wrong timestamps, as pointed out by a NYTimes journalist, and the voice recordings were alleged to be faked, by a mainstream UK-based news agency.
It's quite a mess.
[0] https://www.readtangle.com/the-explosion-at-a-gaza-hospital/