The post reads:
I suppose the repercussions for authors enrolled in KDP Select and submitting elsewhere, would be light. Probably in the line of kicking them out of KDP Select. It is interesting to note though, (at least according to this blog post,) EVERY ebook submitted to Amazon is automatically enrolled, for 90 days into KDP Select. This is accurate information as I tried to delete an ebook that needed format work and was warned that the ebook could not be sold anywhere else for 90 days as it was still enrolled in KDP Select.
There are so many authors in that 90-day window, including myself. I can't help but wonder what the "or else" part of the threat is.