It’s the Daily Mail, it’s most likely total fiction as they do this all the time.

You can aldo hit “isolate” so only trusted connections work

I think the fact that it’s very chemically stable is likely a factor as well so it can be stored for effectively an infinite amount of time & it won’t degrade/react, it’ll still be gold.

Personally I don’t know of any specific research but afaik the reason why our voices sound terrible to us when recorded is because they’re missing the bass that’s transmitted through the skull, i.e. they sound higher pitched on recording. So I’d try increasing the amplitude of the lower frequencies on the EQ, it’ll take a bit of fiddling to get the right balance.