Threats of political bloodshed don't come close to violating board rules?

But that is not what he did. Here is the relevant portion of his post, which you cited in the note:

There is no lecture about what is against the rules, and definitely no threat of punishment. He simply voiced his personal opinion that the poster’s behavior should be against the rules.

If wishing something were against the rules is junior moderating, then half of ATMB is junior moderating.