Yes, that is correct. You can now capture Ditto in Pokemon Go but there is a catch.
Ditto is not on the map
Ditto will show as a random Pokemon on your map – maybe a Zubat, Rattata or Caterpie most likely. Once captured, it will reveal itself as Ditto.
Just look at the video below caught by one of the Pokemon GO players.
— Nick from WhatUpMC (@WhatUpMC) November 23, 2016
If you’ll excuse me, I better get that Ditto now.