Three times no:
I did not insert 273 killed, I inserted "less than 273 killed". 
I did not put back the old reports for HRW, I put them back because they were the only Memorial source (and I said so in my edit just above this one!). 
The source about 300-400 says that is a "starting point", but that refers to the sentence just before, which talks about possible deads, not sure deads. 
I kindly ask you to read my edits carefully and not to misquote me.