When sodium chlorite is activated properly chlorous acid is formed. The resultant solution has some free chlorine dioxide along with the chlorous acid. As the chlorine dioxide is used up, the chlorous acid breaks down releasing more chlorine dioxide in an effort to maintain balance in the chemistry.
The ingestion of chlorous acid has not been studied in humans.
When a sodium chlorite solution is ingested, it is speculated that activation takes place in the stomach. Since stomach acid is HCl, all of the available chlorine dioxide should be released and no chlorous acid is formed.
We do know from studies done with chlorine dioxide (not chlorous acid) that chlorine dioxide immediately breaks down to chlorite ions in the body. Concentrations of chlorine dioxide have never been measured in the blood, so we don't really know if it lasts long enough to get into the blood stream. Chlorite ions have a half life of about 42 hours in the various organs of the body. Some of the chlorite ions do form salt in the body, and the rest is passed out in the urine.
There is often a wide gap between what Jim Humble thinks takes place and the actual Science of what takes place. It appears that Jim Humble has no interest in resolving these issues, so we are left with a bit of a mystery.