I think the Bank's logic is a little broken. It is a catch 22: the currency exchange must be authorized in order to operate, even though bitcoin is not a currency, but it can't be authorized because bitcoin is not currency.
I also think the writer is confused.
Therefore, since there are no applicable laws that can control or tax Bitcoins, they are de-facto illegal (for now). ... Using Bitcoin in any way within the Kingdom of Thailand is banned for now ...
I doubt this is true. Is something illegal in Thailand because it has not been explicitly declared as legal?