Rules-wise I would have to say no, they cannot move onto the upper levels of a ruin. As much as I would absolutely love to have some grav platforms up there, I don't think it is allowed.
I do agree with you that deployment is NOT a form of movement, however, Consider the following.
You believe you should be able to deploy into the top level of a ruin since it only restricts you from MOVING into it, and deployment is not a form of movement. The fluff behind this is that they should be able to put it all together piece by piece up there, airdrop it in, etc. The fluff in the artillery section, however, emphasizes how cumbersome the artillery is, and how its too heavy to lug around (hence the need for wheels/grab platforms for it to move at all)
Using your logic you should be able to deploy infantry into impassable terrain because it only restricts you from entering, crossing, or moving into/through it. It does not restrict you from beginning the game in it. You can see how the logic sort of fizzles out here.
Unfortunately I think your artillery is stuck on the lower levels of that ruin :(
Keep in mind, though, that the ruins section DOES state that you should discuss each scenario with your opponent beforehand for any "special circumstances" and agree on which models not previously listed can enter the upper levels. So you could always try the diplomatic approach and see if he'll let you, since he got his way last time.
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