I wish people would use the terms Depression, Anxiety, and Suicidal appropriately, but they don't do that either.
Apologies if I offended you/anyone with my use of the term OCD. If he can ignore it and move onto something else then it's clearly not OCD. However, the author is obsessed with finding out everything he can about Saturn V, to the extent he travels across the country to look at a sticker on one of parts that on display. Some people would call that an unhealthy level of obsession.