That's not the case at all. All this "gold standart" stuff and BTCs claim is to preserve wealth and poor people by definition don't have wealth.
Let me tell you how poor's life looks like when things are alright: You have a job that is good enough to cover your rent, your food, your bills and the instalments of your phone and computer and you might put aside a little bit that at some time in the future you might use to pay the downpayment of an apartment or a car.
When there's a steep inflation, be it anything from Turkey level to Venezuela level inflation, your salary gets adjusted to sustain your lifestyle and you put your money in Gold/USD/EUR/GBP/AnythingMoreStable or property.
That's it. Poor don't get any poorer just because of inflation. If anything, if the inflation has accelerated the disposable amount of your salary increases in real terms since your loan payments remain the same most of the time. The lender usually incorporates this into the rates but every now and then the inflation can be beyond the expected and you may end up paying much less in real terms.
When the things are not alright, the inflation is irrelevant to you. Whatever little you have, you are going to spend it before any meaningful impact due inflation. Next time you get money, you will get more to match the increase in the prices.
How do I know? I have been there. I've seen an inflation where you cannot predict the price of the bread tomorrow and I have seen a stable inflation where you simply incorporate it into your calculation and you are fine. I've lived in 2 two countries that dropped 0's from their currency, one dropped 000, the other dropped 000,000.
The inflation bites when it is unstable and unpredictable. Then businesses cannot incorporate the inflation into their cash flow and the economy slows down due to risk and difficulties of doing business. That's when the poor are impacted hard because that's when they loose jobs and switch to "things are not alright" mode.