Your wants and needs to matter here.
The Welcome Aboard was in response to anon posting a pic of Potus by Marine 1 saying I'm off to save the world.
I think the critical part is the question:
Do 'reflections' violate NAT SEC rules?
The answer is yes, it does. If that's the case, can Q get away with posting a pic inside AF1 without violating NATSEC? Wouldn't a little known stock photo work just as well for his purposes to just comment to anon and have the added benefit of making (them) lose it thinking he violated NATSEC. Seems like deepstate wants to push the narrative that Q has been violating it to discredit him.
Now that just one example. I'm sure there are others. If you don't want to look for reasons and only believe he lied, then you, my friend, are the close minded one. He didn't lie about it. He never said that was actually AF1.
Lying is a huge red line for me. As of yet, he hasn't crossed it, now that we are learning that everything said is a forecast months in the future. Choose to believe what you want. Like you said, it's best to just move on.