True, the sentence about the items loosing value is incorrect.
However, my argument is still valid, why would I go and buy the thing in the first place, if I just could have waited for today and still have 4$? I would have „gained“ a dollar by doing nothing instead of taking the trouble of procuring the item.
Of course, im exaggerating for simplicity.
As I said the my first comment, I’m talking about stuff that may be shelved a longer time. And at large scales, small percentages do matter significantly.
With inflation, having something shelved only looses value if something newer and better comes out. Deflation would add deflation itself as another risk.
To put it in other words: I have to raise the price for my items in stock along with deflation to make the trade worthwhile, which in turn contradicts deflation since then the value you get for your money is the same.