I am sorry, but nothing of what you say makes any sense, and you are spreading misinformation in a time when one really should not.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7510705/ on the masks and why they are important.
Michel Chossudovsky is a known conspiracy theorist, therefore I won't even entertain anything he says.
en.wikipedia.org
And the reason why I don't is that if we were to debunk every reptilian story that's out there we would be doing that all day.
Russel's teapot and all that.
Your link from the canadian report is also fake (the link is real, but the story is not)
https://factcheck.afp.com/leak-canada-lockdown-plans-fake
Here's a thorough debunking of your first YouTube video.
A video being shared online has falsely said face coverings do nothing to stop the spread of the novel coronavirus and will instead deprive the brain of oxygen, causing damage to adults and developmental issues in children.
www.reuters.com
The link from the guardian is true, but that has more to do with how hospitals are regulated in the US than anything else.
As far as the last video goes, he is pretty spot on. If you actually watch it, he says that the biggest misconception about covid is that it's a disease that only affects the very old or the inferm. Which is true, but it seems to go against everything else that you are pandering, so my guess would be that you just saw the thumbnail and didn't actually watch the video
. You should, it would do you good.
Edit: one more thing specifically on oxigen levels,
http://uknow.uky.edu/uk-healthcare/mask-and-breathe-easy-masks-have-no-effect-oxygen-levels. You can even do this test yourself at home, buy a pulse oximeter and try it out.