Again this idea that Hillary would have won if Trump hadn’t done X is simply rampant speculation. You could potentially prove whether or not Trump did X. You can’t prove how much or how little X influenced the actual results… not unless you claim to be a mind reader.
By that same token. You can’t prove whether or not Hillary would have even been the Democrat candidate had not Hillary, DWS and her allies in the leadership in the DNC had not conspired to put their thumb on the scale to favor Hillary and disfavor Sanders.
We can certainly know that they denied Democratic voters a fair and unbiased primary process. We can’t know or prove that the results would have been materially different had they not done so.