The fee part can't come back.
Let's assume HIVE = $1
100 HIVE->95 HBD (5% fee deducted and burned)
95 HBD->95 HIVE (no fee in this direction)
5 HIVE burned.
If the price changes, the conversion rate can go up or down, and the HIVE supply with it, but the fee is forever.
RE: Burning HIVE! | Nov 2021 | How much HIVE is burned and how?