What this rule checks
Your Ketu is in the 1st house. Ketu is about detachment and insight. The 1st house is about you, your body and how others see you. Source: Phaladeepika, chapter 8 (a classic text), slokas 28 to 33. Notes beyond the classic text are the author's own modern reading. Classic texts describe this placement harshly. Read it as a tendency, not a verdict.