At another point in TFA he says "I've been in the field for over 15 years." The sentence you quoted from comes immediately after a sentence where he states his age. I don't think he was being misleading -- he's been in the field for 15 years, but has been coding for 25. I think the word "officially" might be the source of your objection? Perhaps a fair nit-pick, but in context clearly not malicious. He didn't say "in an official capacity," just "officially."