When the nanobubbles burst, it kills the algae?
Not my field. I suppose it could be a true statement. But it sounds off.

Journalists have both a wide and deep misunderstanding of many things, guns and science to be sure, but also economics and cause/effect relationships and foreign policy and probably everything else as well.
Well, it’s apparently working. 🤷♂️
Ozone is O3, or a molecule containing 3 oxygen atoms.
I was in water treatment for 30+ years. We never used it because we were industrial level water treatment and Ozone would have been too expensive.
Ozone has a very short half life and can’t easily be stored, so it has to be generated on the spot. It is generated by use of electricity (several different methods). High electric usage.
We used Chlorine which is less expensive.
Ozone kills Algae and Bacteria because it is highly corrosive.
It’s benefit is that its by-products are all natural and biodegradable.
It’s draw backs are that it is expensive and the equipment doesn’t last long (at least the last time I looked in to it)