Fixing the supply data is a must to get added to Bittrex.  They rarely add a coin with incorrect numbers by any count. Mary Jane was added under similar circumstances, meaning just having burnt their unsold ICO coins also, and when it was added the was a big disclaimer on the top of the page regarding the coin count. The numbers were proven correct and it was finally removed but that pretty much tells you how Trex feels about coins with incorrect supply info.

Even if a hard fork is required to ignore the burn address permanently and correct the supply info I would take a serious look at it. Although low/high coin supply doesn't always equate to low/high value the reality is total coins is one of the first things people look at when researching a new coin. The lower, correct number would definitely pique more interest and we all know how important first impressions are.