It's certainly possible that Trump helped the Q team choose this song based on JFK Jr.'s last words, though I would be a bit surprised if it were on purpose, given how loose the connection is.

It does seem plausible that the song was chosen before the first Q drop (or at least considered).

It's about statistically impossible for this post to be a coincidence, however. It quite clearly shows Trump not only understands Q, but is intimately familiar with Q's posts and terminology.