Face mask use in health care workers has not been demonstrated to provide benefit in terms of cold symptoms or getting colds:
https://pubmed.ncbi.nlm.nih.gov/19216002/
The volume that goes through directly, does so with reduced velocity.
Meanwhile what goes around - doesn't go "everywhere". Instead it stays localized.
Now we remember the fact that masks don't cancel social distancing but instead go hand in hand - and it seems to show that it would in fact provide a benefit - containing the aerosol in a smaller radius around the mask-wearing individual.
From the summary of your second link... “ There is some evidence to support the wearing of masks or respirators during illness to protect others, and public health emphasis on mask wearing during illness may help to reduce influenza virus transmission.”
That video is the dumbest thing I have ever seen. It doesn't make any sense. Vape Smoke isn't a fair comparision to droplets and aerosolized particles, masks didn't have a good seal at all, in of the them he was still holding the bottom of the mask open LOL.
A visual demonstration why masks don't work: https://videopress.com/v/4egEyh2b
We did not identify any experimental volunteer studies that investigated whether surgical masks or N95 respirators could protect against infection: https://www.cambridge.org/core/journals/epidemiology-and-inf...
Face mask use in health care workers has not been demonstrated to provide benefit in terms of cold symptoms or getting colds: https://pubmed.ncbi.nlm.nih.gov/19216002/