And is this not what happens traditionally as well? Politicians give different speeches to different audiences. Candidates before election talk very differently to various groups of demographies. Candidates who meet individual voters on market squares and public places obviously try to find out which of the voter's wires are hot and try to deliberately connect on those levels that are meaningful to the potential voter.
The structure and interpretation of politicians predates internet and digital surveillance. "If you have to say it, it's not true" applies very well to politicians and especially to political advertisement no matter if it's targetted or general.