Can a mesmerist implant a trick in a creature immune to mind affecting powers

[FLite]

With a few exceptions, mesmerist tricks are not described as mind affecting. But the description says you implant the trick in the subjects mind. Which implies implanting the trick is mind affecting.

[Saethori]

As you stated, Mesmerist Tricks are not described as mind-affecting.

If you have a willing, mindless target (such as an animated undead under your or an ally's control), you may implant tricks in them.

Some GMs may consider this practice dubious, but the rules are clear~

[derpdidruid]

Table variation, that's all I can say on this as its a situation of the fluff and the crunch clashing really hard.