Fair point in general and on those players, I did not get a vote either but there is no way of knowing how the majority of fans would have voted. Either way I am not embarrassed by the vote nor would I have been if those you mention won it.
It used to be a by a voting slip in the programme then they stopped doing that, and it wasn't obvious at first how they were choosing the players when it went to supporters clubs. I assume it is social media now. No issue with anyone getting voted POTY but it wasn't necessarily the best player that season, just the most popular with the voters.