Out of curiosity, I ran a search through some academic databases on “tetrasilver tetroxide”. What I found was a large number of patents (which, as above, proves very little) and some peer-reviewed articles concerning the use of tetrasilver tetroxide in water purification. What I didn’t find was any peer-reviewed article in a medical journal showing that this treatment actually works to cure AIDS. There are some claims online concerning a clinical trial that took place in Honduras; however, so far as I can tell, if this trial actually took place, its results were never published. This seems like a bad sign.
Given all this, I strongly suspect that it’s snake oil.