Not saying he's supposed to know. But his rankings are:
"Corey Pronman’s deep dive into the farm system of every NHL organization includes a ranking of all of the team’s prospects, broken into tiers based on their projection; the impact on the upcoming season and an overall ranking of all players under 23."
With Vilardi, he's suddenly using what scouts would trade for him to justify his ranking. If he doesn't think Vilardi is healthy enough to play, he shouldn't have any impact. If he thinks Vilardi is healthy enough to play, he should rank him higher as he would have a first line impact.
If the ranking were based on value, I would find the ranking more defensible, even if I disagreed.