I agree with you that investors who adhere to the DCA method will not be affected, while those who choose to invest a small amount may likely get affected, in terms of slowing down the accumulating process. For example, if your goal is to accumulate for about 10 years, due to high inflation, you may have to add more years before reaching your goal.
I am a bit confused by your sentence. How can we be affected by inflation while investing? From my limited knowledge, what I understand is that with inflation, your income will also increase and you will be able to buy the same amount of Bitcoin as before. For example, before inflation, your income would be 1000 fiat which is equivalent to $100. After inflation, your income would be 1500 fiat which is equivalent to $100. Here I do not see the possibility of your deposit process being slow. Due to inflation, the value of your country's fiat decreases, but the stable currency ($) remains the same. So I can clearly say that inflation cannot have any effect on your investment journey. I think your investment journey will be the same during an inflationary cycle.
If I may ask you, who will increase your income for you if your salary is fixed or you have a fixed income when inflation hits the economy. It shows that you don't understand the negative impact that inflation causes to people income. It reduces the purchasing power of money. What you buy for $10 dollar would be sold for $11 and you are still receiving the same income which means that the value of your income have reduced. This means that if you are DCAing with $20 weekly, after all your monthly expense and needs, you will be left with little amount of money and your DCA amount might become $10.
Purchasing Power of the U.S. Dollar Over Time.This is why as you are investing in bitcoin, you need to find a means of increasing your income so that you can have the chance of buying bitcoin aggressively and balance your financial life when inflation is around the corner.