Schizoid-like traits can occur in severe depression, but it's different from SPD because it can be alleviated when the depression is treated - like you've been so f*cking depressed for enough time that you don't care anymore and feel totally numb and disconnected from other people and life in general. Maybe this is what they meant? Basically that you were so depressed your were anhedonic (although they likely wouldn't have been able to tell at that time if you were suffering from SPD or major-depression-induced anhedonia)?