The bearish trend will make adjustments to OP's calculations, since when the price of bitcoin falls at such moments, the expenses (sales) of bitcoin will increase (it will be necessary to sell more units\parts of bitcoin to obtain a profit of $100k. per year).
Your math seems to count only for a constant growth over the next 10 years which isn't going to happen.
His calculations are given under "
ideal" conditions, without taking into account internal influences - the
BTC-cycles and external influences, in the form of crises and the like.
That's the point. If we continue to have cycles and you expect to live of this passive income, you may find yourself in deep shit when the crisis, that some people are actually waiting for, begins.