What are defining a Deus ex Machina as?
Is it a plot device whereby a seemingly unsolvable problem is suddenly and abruptly solved with the contrived and unexpected intervention of some new event, character, ability, or object.
If we take that as the definition. So sure it could be said to be contrived and unexpected, but there is no new event, character or ability at play. So it fails that definition. Perhaps some people believe it to be a deus ex machnia bec ause it was a contrived ending