If the title was "The Titanic Was On Fire For Days Before The Iceberg Hit it" I would agree with the parent comment, however as it is now, I read it as you would read "We hit an issue".
Clearly we didn't "hit" any issue, but we started experiencing an issue.
"We hit an issue" is still using "hit" as a verb. And making it metaphorical doesn't help the problem of the iceberg being the subject of that interpretation.
Using it as a noun is like saying "before the hit" or "before the issue". "Iceberg" is an adjective describing the type of hit.
"the Iceberg Hit" is a gerund phrase -- a phrase derived from a verb but acting in as a noun. It's like saying "We went to the charity run". "Charity run" is acting as a noun.
And without global climate change that iceberg would have never been there. It would be happily attached to its ice shelf chillin' with its friends instead of escaping to the open sea.
That's just a matter of your chosen frame of reference.