1722/Wunderman photo series

The photograph tells of a popular phantom time hypothesis that concerns the early Middle Ages and alleged forgery in the date area. The difference is 299 years. His assumptions show that the events from the 7th to the 10th century were false, and the year of creation of this photo is not 2019, but 1722.
The theory of phantom time undermines the existence of Charlemagne, the father of modern Europe. According to it, his legend was created to fill the gap in time.

Is it possible that a phantom hypothesis could undermine the credibility of the date - the year in which we live and our history?