I'm pretty sure the OP is smart enough to know this move could cost him dearly in the future. He's basically setting himself at the 'stake', next to Miso, with his post.
This is why we have to pay a bit more attention than just dismissing his claim and label him childish. Doesn't matter who's right/wrong, the OP felt this was an issue worth risking his rep for (just by posting, he's already a blip on HR's radar). The tech startup circle is pretty small, made smaller by internet and LinkedIn. Definitely a big decision to take something like this public.
I'm surprised at his move taking it public so quickly, and more surprised at Miso going back on their words and expect no repercussions/fallout.