This is undeniably true. But why is this? Obviously it's because his followers listen to him and believe what they hear is correct.
Sociopathic demagogues like Donald Trump gain the trust of, and manipulate, crowds by intentionally reinforcing what the crowds already believe -- "Mexicans are taking your jobs" -- The demagogue is not concerned whether the crowds' beliefs are true, or based on falsehoods and misinformation. The demagogue only wants to gain the crowds' trust and loyalty. What the crowds hear aligns with their own preconceived prejudices and fears. This is how demagogues, although often intentionally lying, win the trust and loyalty of their followers. Once a crowd trusts the demagogue, they become susceptible to new lies the demagogue may use to manipulate them -- "Mexican rapists and murderers are streaming across our Southern Border," "The election is rigged," etc.
Donald Trump has a serious personality disorder called ASPD* and is a pathological liar. It is not uncommon for those with ASPD to be both charismatic and believable. The interesting thing is that unlike in psychoses the sociopathic liar is intentionally lying; a feature that distinguishes sociopathic from psychotic behavior.
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*Most psychiatrists would call Trump's personality disorder by its catch-all name, ASPD, or Anti-Social Personality Disorder. This is the psychiatrist's term that replaces the vernacular term "sociopath," which means virtually the same thing. In Donald Trump's case, his sociopathy is accompanied by severe Narcissism.
Again, you are making a huge mistake here in your analysis as to the cause of this. If only you would look past your hatred of the man to see what part you are culpable in, you might actually come closer to the solution.