First two points are valid. Third is not. "Junta" or not, Myanmar has a legitimate government and co-operating with them as they would with any other country's government is absolutely in line with China's policy of non-interference. Especially since China has a vested interest in maintaining stability in South East Asia, they are definitely not going to be sympathetic to western backed insurgencies. The deposed government before the junta was stacked full of NED graduates by the way. China would be absolutely stupid to actively support a return to power of western puppet compradors who would purposely block regional economic development and co-operation and turn Myanmar into another anti-China proxy instead.