Could you please expand on that, or provide a link?
I've never heard of tinnitus in relation to breathing techniques, and it sounds like something I should be aware of, before starting with the Wim Hof method.
I'm interested in what it says about the cause of tinnitus, since I know someone who suffers from it -- I've experienced ringing in my ears after deep breathing and it was a kind of spiritual thing, sounded like those singing bowls used in buddhism, lots of harmonics and tremolo. As I understand it, the tinnitus caused by hearing damage is not nearly so pleasant..
But if it can be activated by changing your O2/CO2 levels, maybe it could be deadened by some change as well?
There are lots of webpages/videos discussing it if you do a search for "wim hof" and tinnitus".
I cannot find the link, but what I have read is that when you inhale and hold, that the pressure needs to be held in your belly, not in your head. If you hold the air pressure in your head/nasal cavities - that it could lead to tinnitus.
But if it can be activated by changing your O2/CO2 levels, maybe it could be deadened by some change as well?