222 nm?? No way jose. Free radicals don't just stay where you generate them. Even if the UV dose is minimal below a few layers of cells, it doesn't mean that radical damage does not reach live epidermal layers. Just using ventilation is a lot safer and has no real downsides.
Except the current use of the byproduct is not just flaring it off pointlessly as waste. The byproduct is being burned as a fuel, which in that usage is already (nearly) neutral. If an alternative fuel has to be used instead, that fuel is more than likely going to be natural gas or coal.
This was my first reaction as well. I think the subtext is that the byproduct is currently being burned as a fuel source, which is common for things like sawdust in mills. So there's one aspect of this calculation that could be waaay off. If the mills that would have burned this byproduct in a boiler are selling it instead, they'll need another energy source for their boilers! If that energy source is a fossil fuel instead of a wood byproduct, then this "upcycling" has inadvertently become carbon positive (or perhaps neutral at best). And it will be a lot easier to retrofit an industrial boiler for natural gas than to convert it to electric. Even if it were electric, most of the world does not remotely have as clean a grid as Norway's. So it would be some decades before any carbon advantage emerges.
Why should we pay any attention to someone who needs get only one prediction right? That suggests a probability of correct predictions that approaches zero. Let me know when a prediction comes out true. I would be foolish to pay any attention before then.
One guy who makes grandiose predictions about the future convinced another guy who pretends to be a philosopher. It's the blind leading the blind. In truth, they both just make bets as any gambler does.