What this video covers
The clip covers ozone generators, which are widely marketed for mold and do not work as advertised.
At concentrations low enough to be safe to occupy, ozone does not deal with mold effectively. At concentrations that would, the air is not safe to breathe, which is the trade-off the marketing tends to leave out.
The takeaway
Ozone does not fix a mold problem. It removes some odour, which can be worse than useless because it takes away the smell that was telling you growth is active.
Read the full written guide: Ozone Generators and Mold.