That's indeed quite telling about the TOS nowadays: two people from HN double/triple checked the TOS to find a simple statement and couldn't find it. Yet, it's there.
I saw those, but the first is couched within the copyright violation rule, so I assumed it was associated. I.e. we can remove it for copyright violation at anytime.
For the second, I assumed that "if your content was removed for a reason we justified here, we don't have to warn you beforehand."
I'm no lawyer though and I'm sure in court those clauses would be summarily smacked across my face one way or the other.