See their definition of objectification here:

https://en.wikipedia.org/wiki/Objectification#Definitions

As you can see, doesn't apply. A static t-shirt image of any sort is always an object but never objectification, because it lacks the context it would need to be more.

Objectification was never about naked Vs. clothed. It was about how women are treated and viewed as individuals. It is about autonomy and being more than a 2D prop for male character's use.

You can be naked and still have a great deal of personality, story importance, and be respected by both male characters within the medium and the writers. See Game of Thrones. There is an absolute ton of nudity in that, and yes, there is objectification (e.g. background sex) but the show gets a pass because female leads are given a great deal of importance, autonomy, and respect. They're nobody's props or objects.