Just using an algorithm doesn't necessarily remove bias. The actual results of any one algorithm can vary widely depending on the criteria used. Here's a Medium article that shows how some of the popular proposals for redistricting will often make states more gerrymandered.

As long as one party decides what algorithm will be used, they will still be able to pack and crack districts to their hearts' desire. As long as a bipartisan commission is deciding the criteria used, redistricting by algorithm makes sense.