Tubeless will be somewhere between clincher and tubular. Those guidelines would suggest that if you want to run 25psi you want to invest in a tubular wheelset.
It's also worth noting that there is a certain skill and finesse to riding a tyre at a low-pressure, you can't expect to bash into everything and get away with it.
Helen Wyman's formula is a good place to start:
Tubeless will be somewhere between clincher and tubular. Those guidelines would suggest that if you want to run 25psi you want to invest in a tubular wheelset.
It's also worth noting that there is a certain skill and finesse to riding a tyre at a low-pressure, you can't expect to bash into everything and get away with it.