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You could try reading the article next time, rather than having a hot take based on the headline.

"The HBOT protocol was administrated in a Multiplace Starmed-2700 chamber (HAUX, Germany). The protocol comprised of 60 daily sessions, five sessions per week within a three-month period. Each session included breathing 100% oxygen by mask at 2ATA for 90 minutes with 5-minute air breaks every 20 minutes. Compression/decompression rates were 1 meter/minute. During the trial, neither lifestyle and diet changes, nor medications adjustments were allowed."

I am wondering how the subjects avoided oxygen toxicity (see https://en.wikipedia.org/wiki/Oxygen_toxicity for example.)

Also, this is half of what needs to be checked. Does lengthening your telomeres have a measurable effect on your health?

From the article - every 20 minutes they used a mask with (normal) air, from what I remember reading it a couple of days ago.

Net/net it's probably safer to put a pint of blood into a hyperbaric machine than a complete human.

They could take your blood, treat it and put it back in. It could have the same regenerative effect as injecting blood from a younger person.