Oh sorry I gave benefit of the doubt and figured you weren’t just being obnoxious.

Since you apparently don’t know what an estimate is, here are general explanations for that estimate

The 6,500 figure actually refers to all deaths of migrant workers from Pakistan, Sri Lanka, Nepal, India, and Bangladesh, regardless of cause… There is clear evidence of thousands of migrant worker deaths in the lead-up to the World Cup,” said Human Rights Watch’s Michael Page

It’s extremely easy to find sources other than the guardian for an insight into this but you sound more interested in swatting people down than correcting or getting good info.

In total ~15,000 non nationals died overall as a general stat, but it’s hard to argue that the working age immigrants mostly died of heart attacks.

Qatar’s official response, if you want to go with that, was 37, then 400-500, then 37. Now you have the full range of estimates, maybe try to provide one of your own next time.