You guys are missing the whole point of his post. You guys are talking about the draft, he's talking about the "he can literally only play 1 year for us" part. When he says that's not how it works, he means that Williams would have 2 years to play, no just 1. He wasn't talking about the draft eligibility.
No... His point was all screwed up because he was confusing the 5 yr eligibility rule with draft eligibility (see the Brandon Weedon reference), and it was misapplied to Williams in any case. This said the number of correcting responses is overkill.