That's the normal practice in such deals. The buyer has to settle any outstanding liens. Of course, that hammers down the price the buyer is willing to pay, so BAC ends up effectively paying part of the tax.
The cool outcome in this case would be for the tax lien to grow to the point where nobody will buy the property. May the weeds grow! Couldn't happen to a nicer county.
Every one that i’ve bought the bank had to pay off outstanding liens and give me clear title.