I am sure if you research your insurance they will cover covid. If not you will have to get cover as airlines from next week will demand it...all to keep China happy lol.
Sorry I did realise it was his first. I actually did my first online with no problem but each region seem to have different rules. But if he trys on line it either be accepted or rejected with a reason why.
Just one last thing do you apply a month in advance or probably 6 weeks taking into account other demands for paperwork. I use Mae Sai Chaing Rai which is very quiet due to border being closed.