No, CA changed it in one of last patches as otherwise elephants, cavalry, artillery had just dimounted mahouts/riders/crews, which was pretty poor design choice.

Overall naval landins are very flawed and game would have worked out much better if they were only available to naval untis and not lands units on transport ships as it just bugs stuff out.

This was a very good decision by CA, shame they did not extend it to infantry.

Side note, naval landins can lead to infinite battle bug unless you have a timer set.