Is it true what the Mayans said?

This is not true. Maya had the custom of divination, but the level of divination was not high, and it still stayed at the level of Shang Dynasty. At best, even Gui Kunyi is inferior. Merchants also carved tortoise shells of Oracle Bone Inscriptions to burn fire for divination. The level of divination was developed in the later Zhouyi and even the Warring States period by combining the theory of Yin-Yang and Five Elements. By the Han Dynasty, divination had been further developed, and Fang Jing's nail-taking method began to become the mainstream prediction method. In the Song Dynasty, foreknowledge prevailed. Whether it was the bodhi old zu Chen Chuan, Dao Mayi, Shao Kangjie and Xu Ziping, or the plum blossom easy number, Wei Zi's bucket number and four-column eight-character, there were also masterpieces of equal learning of Huozhulin and Yuanhaizi. In the Ming and Qing Dynasties, the theory of geomantic omen reached its peak, and books enriched the golden strategy. Adding and subtracting cloth, changing Yin, Yi Mao, breaking secrets, three life meetings, descending marrow from heaven and Shen Shi metaphysics almost all reached their peak. In the Republic of China, there was a manuscript of A Thousand Miles of Life by Wei Qianli. Is such a rich and systematic prediction system entangled in the Mayan pseudo-divination?

Another possibility is that the Mayans used magical powers to predict, rather than divination. This is unlikely because the avatar needs to meditate or go out. From the Mayan environment, the conditions for yoga meditation are not sufficient, and going out is nonsense, so this can also be ruled out.