The article does not raise any evidence for the existence or non-existence of alien ufos from outer space.
This is a fairly good executive summary:
from article: The government’s historical engagement with such fare can most thoroughly be discussed with regard to the Department of Defense (DoD), which has worked extensively with Hollywood in exchange for the right to edit scripts for sixty years with the principal aim of encouraging recruitment and retention of personnel, as detailed by Suid in his extensive tome Guts and Glory (2002) and by journalist David Robb.
Add to that some examples of obvious and heavy handed media control in the 50's and 60's.
Leaving aside the 50's and 60's examples, essentially the article is saying that film makers are getting access to military facilities and assistance with employing military hardware in their movies - and in return they agree to give the agency they are dealing with (Dept defense, CIA, etc) script revision rights and the opportunity to influence public (and international) perception about that agency, more or less for whatever purposes they choose.
While I find it a bit creepy that u.s goverment agencies have wide creative control over hollywood scripts, and it makes me think about some of the movies I've seen recently, essentially this seems to be a tradeoff that some film makers are choosing to make rather than something that they are forced into.
Beyond this, the article kind of infers that because these agencies also use this access and creative control to manage perception of alien UFO's - alien UFO's therefore must exist.