True although I thought it was a little odd that they didn't give any info to the presenting teams who were left floundering. It wouldn't have been so terrible for them to be able to report that
"there was a serious crash during the start of the GP involving x,y and z - cars are being recovered and emergency services are in attendance - we'll update you with more detail once we know that Zhou is OK. We are told that the incident seems to be a racing incident where Gasly got squeezed between Zhou and Russell causing Zhou's car to flip and go into the barriers - meanwhile a second incident with albon seems to be the result of Albon slowing for the first incident and vettel going into the back of him."
All of that could have been shared without the need to show the footage immediately rather than "well, we don't know why the race is red flagged - hoping to get more detail soon".
They knew who'd been involved, but didn't have any information on Zhou, other than he was trapped and where.
The teams were also well aware of why it had been red flagged. The car going over the tyre barrier wasn't shown until they knew he was out of the car, and safe.
Contrast that with Haas in 2020, also on the first corner, where replays where shown straight away. They still didn't have instant information on the condition of Grosjean. But continued to show the incident while waiting for that information.