I felt as though there should be some follow-up to this topic, even though the topic is no longer as current as it once was.
According to the below article, Grant Wahl died of a ruptured aortic aneurysm and not from Covid or other virus-related reason. Although the World Cup had great potential for being a superspreader event (and I have little doubt that it
DID contribute to Covid-related illnesses in it's own way), at least we can conclude that Mr. Wahl didn't die from the virus but from an undiagnosed heart condition.
To be completely fair, extreme heat and a significant change in venue (along with the stress associated with being at the venue in a professional and not personal capacity) will exacerbate any adverse health conditions.
LINK -
https://www.cnn.com/2022/12/14/us/grant-wahl-cause-death/index.html