If it's an update to the Docker images, that normally takes a couple minutes, if it's a rolling deploy. It is possible to turn off the rolling deploy, but there will be downtime.
Google uses neither k8s nor Docker internally. From my knowledge, a change like this can take anywhere from a couple of minutes to a few hours to roll globally, depending on how much support was already in place.
It's so weird when people just go on the internet and lie about how things work with such utter confidence. No 'I believe', no 'if things are still done that way' just pure lies typed as fact.