Also affects the new illusion_illager as of 17w16a. Because it only affects living mobs without spawn eggs, will likely stop affecting it once it gets a spawn egg.
No, it was not; the a snapshot was lacking mob statistics in general; scoreboard criteria didn’t find it, and killing any mob did not result in the statistic.
I really don't get how this is marked as resolved? Just realized that. Iron Golems, Snow Golems, Illusioners and Vexes still do not appear in the stats. This issue is not resolved as of 18w48b.
Confirmed.