Three people have changed their opinion in favour, vs one who's changed their view against the idea that dowsing works, so assuming there's no fraud, it seems like his debating style is very effective at convincing the undecided that dowsing works.
This proves that using scientific reasoning is not the most effective way of changing people's views.
I think it also shows, again, that when any doubt, reasonable or not, is thrown into a subject that people tend to go with belief rather than facts. This can be seen in the rise of flat earth idiocy and numerous conspiracy paranoia. There seems to be a characteristic of humans that skews our thought process to believing in magic, unseen forces controlling us, and general woowoo.
It is sad that people have decided to change their mind in favor of dowsing being real. This is why we need to fight against the woowoo BS being spouted and keep vigilance. The Deepak Chopra word salad and non-sequitur ramblings seem to have either confused people or have convinced them with the pseudoscience nonsense.
It is also a fact that when someone cries victim, people will tend to side with them. The false claims of being victimized is a usual tactic for those who wish to sway people to their way of "thinking". It is a shameful and low class tactic. Unfortunately it works.