Is Tianqiao fortune telling credible?

What was the result of the old monk on the overpass telling Li's fortune?

Li once asked an old monk to count his life on the overpass. The monk's chanting is:

Yin turns to Yang, Yang turns to Yin, and the word Yin and Yang will definitely dry Kun.

If you want to turn all misfortunes into blessings, don't enter the royal door with an empty door.

Li asked the old monk what "empty gate" and "imperial gate" meant, and the other said, "empty gate means becoming a monk, fasting and chanting Buddha like me, while imperial gate means the Forbidden City."