I echo everyone elses comments.

This makes The WMC look like a mickey mouse organisation.
Reading between the lines, I suspect they thought Liam didn't have a chance against Namphon and so they were happy to take the sanctioning fee, expecting that Namphon would retain his title anyway.
Liam proved to them and everyone else that he can mix it with the best of Thailand and his achievements MUST be recognised.
Moreover, I understand that The WMC THEN sanctioned his title defence against Sarmsamut Kiatchongkao. This is ridiculous.

WMC please decide what you intend bringing to the sport. I say this without prejudice, however if you are not prepared to recognise a fighter simply because of his ethnicity then I believe that you have failed to realise your most fundamental obligation... to Council Muaythai WORLDWIDE.

If your own preconceived prejudices are stopping you from doing this then just be honest about it, call yourselves TMC (Thailand Muaythai Council), step aside and allow another association to do the job properly.