I’m from Australia, and did my bounce the other day, as I watch this group daily. I don’t think you’ll be allowed back in without the medical certificate + insurance. So, unless you’re 100% you can get these documents, I’d probably go back to aus while flights are still running.
I think it’s because a lot of people don’t have the medical certificate + insurance. Thailand reminded the airlines that if the passenger doesn’t have this, the airline will be responsible for covering any costs.