There might be instances where it could be true, but the pH would have to get under 7 for that to happen (ammonia<->ammonium remember), so it was either very soft and neutral to begin with. I've worked in that industry and I measured the pH in bags and most farms, wholesalers and shops do not use these kind of conditions. Fish aren't fed before shipping overnight, bags are filled with oxygen not air, and coal is often added too. When normal stocking is observed for bags, it is not a concern.
pH not temperature is why you drip, I always do it and recommend everyone does it.