Well, I wouldn't necessarily call it a total loss, but it's going to be a bit of a gamble considering it hasn't been tested but used to work some undetermined number of years ago in an Amiga 3000.
Also look at the backside of the board, there are some dark spots several places around the area of the battery. If this is a multilayer printboard and the battery fluid have penetrated through the board there are likely some damage in the middle layers as well.
