Well, the rear wing did look exceptionally sketchy there, and he scattered a bunch of carbon fiber on the track, and the team did this to avoid a SC. Maybe a bit harsh for Pérez, but a justified penalty for Red Bull, imo.
The team confirmed in the hearing that the driver had been advised to bring the car back to the pits as they were trying to avoid a Safety Car situation.
Seems unfair for Checo to get a 3 place grid drop in this case.
The Stewards determine that, as well as a financial penalty for the team, a sporting penalty is necessary due to the safety implications of the incident. The penalty is imposed in line with precedents.