I gather that Liquid 0
2 doesn't exist above -118 deg C. If you charge a cylinder with liquid oxygen at -200 deg C and let the temperature rise to room temperature, it will be a supercritical fluid - apparently that is the state when there is no difference between a gaseous state and a fluid state, but it is definitely not a liquid.
I think with practical pressures, you can only have compressed gaseous oxygen. I would hate to think what pressures you would get in the cylinders from supercritical oxygen in the boot of a car on a really hot sunny day.
If by "Liquid Oxygen", they just use liquid oxygen to partially fill a cylinder, and then let it warm up to a compressed gas state, then to ship by air, you need an expensive ATA-300 Category 1 case to ship the cylinders. This is a legal requirement particularly in the US.
Unless, of course, you are scuba diving on the moon Titan where the temperatures are perfect for bottled liquid oxygen and they have all those great methane lakes. The Triton is the perfect device for recreational diving on Titan.
One of the many things that really do not make sense is that if this product was close to production, they would have done thousand of hours of testing. They would have had no end of full uninterrupted 45 minute video clips of test divers swimming around underwater. They could show someone inserting the cylinders, and then doing a full dive. Instead, they had to actually rent a pool just to do the most recent clip where a diver managed to stay underwater for 7 minutes (something like that) with no activity. There is nothing to indicate that any functioning prototype exists.
All they have proven is that they have made an object that resembles the CAD renders and it can make nice bubbles.