Dozens killed in strike on Iranian girl's school.
Then the next line mentions uncertainty as to whether or not it was Israel or the US, but it was clearly one of them.
The NYT can verify that 'dozens were killed' there just as easily as in the other story.
I have no idea why you don't think they have access to Reuters or the AP, who both verified that part quite quickly.
https://www.reuters.com/video/watch/idRW953528022026RP1/
Oh hey look, Reuters basically came up with the same headline that I did.
Except that they also attribute blame to Israel.
In summary, you're completely wrong.