I generally don’t disagree with your speculations, or sources.

However - it is important to remember that ufo’s and aliens are entirely separate. They are falsely conflated by a psyop (since the late 40’s) to discredit and suppress discussion/study/reporting on the former (ufo’s NOT aliens) - don’t fall for it!

Ufo’s are very old, but our ufo’s - known as flying saucers - first began appearing around the 40’s.

Aliens never existed, and are entirely modern fiction. They are a fictional character that hails from a fictional scene location (“outer space”) which itself was first created around the 1700’s.

As i said, the modern grey that we all know and love was first created in the 90’s. Aliens are entirely fictional, and very modern. Ufo’s are another matter entirely!