Hm. Well, I hope that "keep training" doesn't involve seiza. Otherwise, I don't know about bone spurs, but given the explanation of the mechanism of injury, I don't see how it's possible for the pain to just go away when you're doing something that actively aggravates the problem.
Yep. Too many of us have seen small problems turn into big ones or acute problems turn into chronic ones, because we were too proud or too short-sighted to adapt our training to the very clear needs or limits of our bodies. Some things that are NOT improved by stretching or repetition.