No. It's the fact that if the price of HIVE goes way down to the point where the debt ratio between HIVE and HBD is below the haircut rule, the you no longer get 1 dollar worth of HIVE from your HBD when you convert it on-chain, you get less (proportionately to how much lower HIVE is in value). That means you could risk seeing your HBD fall down to something like $0.75, which would obviously ruin your gains if you sell at that price.

Thankfully, the current value of HIVE is quite a lot higher than where this becomes an issue, but that may not always be the case if we go into a harsh enough bear market.