It's not false.  Trump won the electoral college 304 to 227, that's a landslide.  The Electoral College is based on votes, it's not imaginary.   

Clinton may have barely won the popular vote (maybe) but it doesn't mean she was the more popular candidate in the entire country.  Clinton only won 21 states.   

Clinton's support was restricted to big cities in the coastal states (California, New York) so her voters did not represent the entire country.   Trump won every other state, so Trump's support was more geographically widespread.

Also, Trump didn't campaign for the popular vote.  If he had, he would have won it.