I don't have a problem with it.
Of course YOU don't have a problem with it.
You are perfectly fine rejecting reality and replacing it with fantasy.
You are perfectly fine repeatedly contradicting yourself.
But others actually care about reality and about having beliefs which are consistent with each other.
To those people, it is a massive problem.
They notice the lack of air means there is no where for the heat to go, which means things don't just spontaneously freeze. They recognise that the effectively 0 thermal mass means the temperatures quoted are irrelevant.
What matters is managing any heat that is generated.
They do this by venting water to space, where it needs to boil before it vents, and it boiling cools the rest down.
Likewise, others would want claims about the oxygen tank to be consistent and make sense.
That means they wouldn't just want 8 l as the tank capacity as it doesn't tell you how much oxygen. Instead they would want something like 8 l at 100 atm.
Likewise, they wouldn't want 3000 l/hour as the amount of oxygen needed, as it is pure BS with no justification at all.
If it is meant to be pure oxygen at 1 atm, that an insane amount, requiring you to empty and refill your lungs once a second, and use all the oxygen in them. No one is doing that.
And if you want more reasons why that is pure BS:
3000 L equates to ~123 mols of O2. (multiply by 1 atm and divide by the gas constant and 25 C converted to K).
That equates to ~2900 mol per day.
But each mol of oxygen you use is combined with carbon to produce carbon dioxide.
If you ignore the other things combine with the carbon (typically oxygen and hydrogen to make water) that equates to over 35 kg.
That means if you didn't eat, you would lose 35 kg each day.
It also means if you tried to feed yourself just using sugar, you would need to eat ~88 kg of sugar.
How many people do you know of eating 88 kg of sugar each day?
So again, your number is pure BS.