The immortality bit doesn't explicitly mention them, but I'm assuming (and hoping) that it also applies to Hounds?
Also while we're on this... I've been asking for this for a long time, but can we PLEASE be able to see the duration of Hound mods that rely on a timer (Null Audit, Reflex Denial, Diversified Denial, Evasive Denial) as a player buff? Saying this as someone that always runs Null Audit, so I know when I need to start focusing down Arctic Eximus' so my hound doesn't copy them and make all our lives miserable. Every other mod that provides a timed buff (including some companion mods iirc) display a timer, EXCEPT the Hound ones, which I think should as well. Its a simple QoL change that would be greatly appreciated.