That mantra needs to be retired.
When people talk about the price, they are referring to bitcoin’s purchasing power. Nothing wrong with pointing out that the purchasing power of bitcoin fluctuates.
1 BTC = 1 BTC doesn’t communicate anything, unlike the price, which tells you how many goods and services you can redeem from the market.
You would think this is obvious and understood by people saying the mantra, but you would be wrong, unfortunately.