flip flop his position so many times that now i can't trust any thing he says as a Medical professional,am i wrong ?
Yes, you're wrong. The people you shouldn't trust are those who start from one position, and then stick to it relentlessly, even when evidence piles up to confirm that their position is incorrect.
you for sure cant trust someone who keeps on changing his opinion void of any statistics.
I'd argue the point about absence of stats, or data. If a scientist starts from one position, and then new evidence arrives, which causes them to change their opinion and position, then that's certainly a good thing.