One in a million as OP pointed out is usually about having the amount out of the total supply not the current supply. currently it is 16+ million coins and it is rising by about 1800 bitcoins every day. so if you want to consider the current available supply you need to increase the amount you hodl every day.
OP have included this part --> (ignoring the number of coins lost) on purpose. The statement will be even stronger if you factor in the lost coins,
but nobody knows how many coins are lost, so for that reason he has left that out. It is still a huge accomplishment if you can acquire the 21
bitcoins are become part of a small group of people who has done that.