Absolute truth is not relevant because 99.99% of what you need to sustain yourself is physical. It’s practically 100%.
Maintaining BTC itself requires physical inputs and physical property rights. You need fiat to buy energy. Your house with mining rigs needs enforcement of property rights.
The physical inputs to bitcoin are decentralized and robust against disruption. You don't need to be a miner yourself to store or transact.
> You need fiat to buy energy.
This is a circular argument and not true. You can buy energy today with gold or bitcoin.
The innovation of bitcoin is precisely making this statement no longer true. The "property" might only be digital data, rather than physical things, so you can argue that it is no longer true in only a limited context, but it is not longer absolutely true.