But seriously, meadsjn.
The caption of the first photo was "Welcome aboard."
"Welcome aboard. jpg was a big lie" was a comment made by an anon on a photo HE posted that showed the first light/lamp photo fit perfectly in the AF-1 office.
I think the comment may have been a sarcastic response to other anons or shills (purely guessing) who may have challenged the veracity of the first photo titled "Welcome aboard.
Just a theory.
I agree with your other theory. That the plane was bugged by Obama. I think Trump (and Q) were trolling Obama by showing him that they found his "mug holder" spy devices that he had the dirty CIA plant in the office.
(theory courtesy of generally. See generally's post and the Oracle for further details.>
Bagster
I disagree, baggy, the Anon was calling Q a liar. Take it in context. The anon was showing it was possible to construct the first image by Photoshop overlay on a stock image of the Air Farce 1 Presidential Office, distort it and claim it was taken as described. Q responded rebutting with another anon's ad hoc photo essentially easily duplicating the AF1 photo at home by using an iPhone 7 taking an image of a lamp's reflection on the back of his wifeana's iPhone X with no need for complex Photoshop trickery.
Looking at President Trump sitting at the desk, I can visualize exactly how the original was taken from that position. Holding the iPhone upside down in the right hand at arm's length, the tweeting twitter phone was then used in the left hand to snap a photo of the lamp's reflection. This accounts for the apparent distorted Apple logo due to the iPhone's angle to get the reflected lamp, which the Anon had to squeeze and stretch the image to fit from the other perspective for his "photoshopped lie" claim.
The position works, however, from where the President is sitting. Proof that Q took the image from the presidential chair. . . and may be Trump.