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I'm neither qualified nor in a position to research the potential for SARS2 transmission. However, so far as I'm aware the studies that are available such as this one strongly suggest that the transmission mechanism is droplet-based (apart from direct contact with body fluids and faeces), hence the consistent advice to keep a 2m separation.
Of course, if you have credible evidence to suggest that someone shouting in their garden represents a serious health risk, then you should contact the CMO urgently so that the NHS/HMG can review their existing advice and make sure that no-one shouts outside. Or hollers. Or exhales. Indoor breathing only.
Brommers-
https://twitter.com/mvankerkhove/status/1241830233101275137
"#COVID19 is not airborne
#COVID19 spreads via droplet & contact transmission
For #HCW, @WHO has always recommended droplet precautions, except when preforming aerosol generating procedures, where we recommend airborne precautions"
William.
Cool if your own research has shown otherwise