Do not think he has much to whinge about as Thailand Elite are repeatedly announcing these conditions such as below probably aimed at members like the poster. The info has always been freely available and accessible. Its the members' obligation to read it.
I do not think they could dumb it down much more. From recent Thailand Elite communication ....
"Under the Thai Immigration law, it is illegal for foreigners to overstay the visa or permission to stay in Thailand. Thailand Elite members are required to extend your stay permission before the expiry date stated in your arrival stamp or your extension stamp, otherwise you will be considered as 'overstay'.The penalties for overstaying in Thailand vary depending on the length of time you have stayed in the country past the visa expiration such as a fine, ban from entering the country, imprisonment, and deportation."