They should have. You are correct.
The blue post does not read like it was to be an overflow realm and note that I also thought it would be too but that is not what the blue post says so anyone who trusted Blizzard would have trusted the comment:
This means that poster is wrong and you are right.
He did ask in that thread for the transfers and he seems to have been very upset by the queues. So he got his way. I also highly suspect he will be leaving for Benediction come Wrath and the comments are made for selfish reasons, uncaring about the health of servers, with only thoughts about the short term over the long term. So not a person to be respected.
I don’t really have any skin in this game as I haven’t played fresh but it’s unfortunate that the Fresh start realms won’t long-term be as good as they could be.