Article from the-race.com on the penalty Norris received for backing up the pack to create space for a double-stack. The article starts:
Lando Norris and his McLaren Formula 1 team were surprised by his penalty for “unsportsmanlike” conduct in the Canadian Grand Prix and felt it was a departure from how such incidents are usually judged…
I have not much of an opinion about whether this behavior should get a penalty or not… but good stewarding is consistent stewarding, and this is not that. If they are aiming to establish a new stricter and consistent standard here then it seems that should have been articulated in the race-director’s notes and driver’s briefing at the start of the weekend. If this batch of stewards just don’t know the relevant precedents and backing up the pack will be fine again next race… well… doing better than that would be nice.
I think it is fair. He is disadvantaging Charles and Alex. The condition is because it was under the safety car Charles and Alex can’t overtake him because he is driving slow. Their logic of it is okay to slow down only applies in full race conditions where he can defend and try to stop them overtaking him.
Responded in another comment, my own issue is not whether the activity is allowed or not, but rather whether teams can predict what’s allowed in advance. No team is surprised by a penalty for speeding in the pit late, and the rule cited there is always consistent. Similarly, teams should know how much of a gap they can or can’t create under safety car conditions, and the rule enforcing that constraint should be consistently cited.