This is only applicable if Bitcoin continuously move in an uptrend path. But once Bitcoin meet its APEX and prize stabilized, it can be affected by inflation in one way or another.
I greatly agree don't just hold fiat use them to invest, best if it can be used to create a profitable business than can produce continuous stream of income and not just a one time profit. Since I believe, to overcome inflation we must earn income that far surpasses the inflation rate in order for our life to be unaffected by this common event.
They had successfully goes through all the problems and troubles financial life had given them and ends up with savings, so I don't think you should feel uncomfortable for them.