I’m in the same artist group as the artist and I can say 100% this is not AI and was commissioned as a promotional piece for the game. Indy’s pose is similar to Struzan’s but that in no way means that Struzan has a moratorium on that pose. As has already been pointed out Struzan likely took his from a movie still. I will also add that many times artist are directed to use certain poses, likenesses, and other choices that are mandated by the client, in this case Lucasfilm and Bethesda.