Its a farce, they are trying to say because he actually came out and said he'd field a weakened team in the hope of winning the next game, while most managers simply make the changes, though most aren't asked why.
Arsenal along with most prem teams should all have received similar suspended(and by now, several real fines) for fielding weakened teams in the prem league over the years, and most of the cups, champs league included.
Hell teams do it in the world and euro cups, its insane to punish a single team for doing whats asked. LIkewise Wolves, by fielding a weaker team in one game they thought they couldn't win, improved their chances of their strongest possible points tally for the season, so one weak game might have lead to a stronger season. LIkewise giving players a chance for fitness and form in a game they had no chance of winning, is better than giving them a chance in a game they might win but can't with less fit/in form players on the pitch.
From recollection Spain and Portugal played weakened teams in the final group games in the Euro's because they were already through, I'm sure most other teams did the same when they had the chance.