Well I don't really know your interpretation or definition of being rich or poor, but however I believe the point they are actually trying to make is that know matter how the Bitcoin price may rise the opportunity for the poor or rather less privilege to accumulate Bitcoin will always be there because unlike other stock investment that requires buying or investing on a larger amount of money but Bitcoin does not discriminate in times of amount of money used for the accumulation.

So however it doesn't necessarily mean that the less privilege most accumulate using $5 on a weekly basis perhaps if they cannot afford that amount they could easily re strategize that since they cannot afford $5 on weekly basis they could extend there accumulation to two weeks or three weeks so that it will enable them save enough money before the two weeks will reach.

So whichever way we evaluate it there would always be no discrimination in times Bitcoin accumulation.