Occam's razor is not a proof that the simple story is true. It is a preference: do not add an assumption you do not need. Two explanations can both fit the facts. The razor says to start with the one that invents less. Nature is allowed to be complicated. The razor is a rule for us, so we do not decorate a theory with our favorite extra causes.
Worth knowing
Prefer the explanation that assumes less. That is a habit, not a guarantee.