Can a man's claims in Morocco that he can cure illnesses merely by seeing a patient's picture, or by touching them using the power of a thousand venomous snakes and 665 million righteous jinn, be true?

The appearance of extraordinary phenomena is not evidence of righteousness; they may appear to both the pious and the wicked. They are a karamah (divine favor/miracle) for the righteous and a istidraj (gradual enticement/misguidance) for the wicked. The criterion for distinguishing between them is the adherence of the person to the Sharia and their following of the Sunnah. In this case, there is no impediment to seeking treatment from them. However, if the person is deviant or an innovator (follower of bid'ah), then they are either being gradually misguided (mustadraj), or they are a charlatan, or a sorcerer. It is not permissible to approach them or seek treatment from them, as the Prophet, peace and blessings be upon him, said: "Whoever comes to a soothsayer or a diviner and believes what he says, has disbelieved in what was revealed to Muhammad, peace and blessings be upon him," and "Whoever comes to a diviner and asks him about something, his prayer will not be accepted for forty nights."