[Post Rewards will be sent to Hive account@null]

Well, it's at very least an inaccurate statement.
Curation rewards are not part of post rewards.
You haven't set Hive account@null as beneficiaries of this post which is the only viable way of doing so for author rewards, otherwise you can (but don't have to) send liquid part of author rewards to Hive account@null, but how about SP?
Anyway, I see no reason to trust this when it could be easily setup in a trustless way.