www.bmj.com/content/373/bmj.n1030
Largely an opinion piece but I doubt there is an embargo on such research from on-high.
Aerosol/airborne spread (ie talking/singing/breathing) is very likely but to a significantly lesser extent than very infectious diseases eg measles with R(unvaccinated) typically 15+.
Covid's relatively low R suggests aerosol spread is much less effective than being within 2m range (droplet spread) of a virus ejector, and good airflow (even just being outside) appears to reduce the aerosol risk greatly.
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