Caleb Joseph is trying to pin this on Vlad based on a poor secondary lead and wide turn around third base, but I put that fully on Rivera with a bad send. He should know Vlad isn't a great baserunner and has below average speed, and this was against a right fielder with 95th percentile arm strength. Given Vlad's girth I would surmise that this is a typical third base turn for him given the centrifugal force involved.
Garcia leads all MLB outfielders in assists over the last 3 seasons, so this is categorically NOT a player you want to be running on. This was just a mind bogglingly bad send, even for a coach who has a reputation for bad sends over the years. The only possible defence I can come up with for Rivera is the high likelihood that Vlad would have ran through the stop sign anyway, but he has to at least try to stop him there.