the video talks about the underlying value backing a currency
bitcoin has a mining cost behind it.. and a security cost.. now go check how much it costs to print a $100 bank note($0.086)
FIAT underlying value is not secured by its minting/printing cost. as that amount is super small
its only backed by laws that enforce its use like fines, taxes and minimum wages which assert people need to use, account and measure their time, labour, crimes and participation as a citizen in fiat
bitcoin does not need the laws of participation to back it. instead people participate freely(freemarket) without force. thus back it along with the mining cost to give it underline value without force, but instead freedom and desire of its abilities and functions and utilities
bitcoin does more functions than fiat does.. it even works as a deflationary currency instead of inflationary fiat, so has many advantages
if the world cannot mine bitcoin for less than $25k a coin, that gives it initial underlying value to pay alteast $25k for it.. then the freedom of participation (desire to use it) adds on the rest
yes the participation is not forced and instead just freely given. but thats the advantage, you are not forced to give a bitcoin government 20%-40% of your participation to a bitcoin government. instead you just use bitcoin because you want to not because a government made you do it
bitcoin has utility beyond fiat capability. which is why people are willing to buy it and use it