Sure, but in the OP case, the children didn't put their foot in Thai soil yet. That's why I commented this was a bloody smart idea they had to get a long term visa...
Diplomats are often over protected and out of the real world. I know one evacuated to Bangkok for kidney stones although there was a 5-star hospital in southern Thailand where he was working.
In my humble opinion, the true nonsense is you, knowing 6 weeks in advance that you won't be able to travel back because of covid (which is the very purpose of the 60-day extension).