1 quart every 2000 miles is not abnormal oil usage and needs no repair. The suggested rebuild is totally unnecessary.
However, you need to learn to check your oil periodically. Having gone 6,500 miles without checking, and having subsequently let the engine run that low on oil, you’ve certainly shortened the life of the engine and probably increased the amount of oil that the engine burns. You are very lucky that you still have a functioning engine and not one with frozen mains or bearing knock.