Thai purchase of Royal Project land possible?

My understanding is that land sold it Thailand should have a government chanute document for proper legal ownership. This is usually the case for buying a house or land anywhere in the Kingdom.

A Thai friend said she was told she could get ownership of land in a Lahu village in a Royal Project in the mountains outside of Chiang Mai. She questioned whether she would really 'own' the property since there was no proper chanute. Instead she was told the village headman has the authority to transfer land deeds. Does anyone know if this is actually true? Without a chanute document I would worry that the land isn't really 'owned' and that the status could change in the future which makes investing unwise.