The PT4 Visualizer only shows the ranges for the selected player and does not work with multiple players, that has not changed.
An alternative as was previously suggested. While not as visually effective it would still give you the information in a table.
What you can do is create an All Players report on the My Reports page, add the Hole Cards stat, remove the Player stat and add a filter Not(Player is Hero) to exclude your data and then you can see hole card stats for all of your opponents.
I do not want to derail this thread with the HM discussion but from a quick test I completed, I don't think this works accurately on HM either. I looked at a single player, then added him to an alias and compared the numbers. Even though the alias had a few thousand more hands the number of hands returned for the alias was a decent number less than the single selected player.