My point if you can connect it is that the term trade war is a new term made up as a buzz word and possibly also used to confuse people who do not have the capacity to google.
Wikipedia Article on Trade wars date back to 2014 and all apply
From Current Page (9/20/18)
A trade war is an economic conflict resulting from extreme protectionism in which states raise or create tariffs or other trade barriers against each other in response to trade barriers created by the other party.[1]
From 2008
A trade war refers to two or more nations raising or creating tariffs or other trade barriers on each other in retaliation for other trade barriers. Increased protection causes both nations' output compositions to move towards their autarky position.
From 2004
A trade war refers to two or more nations raising or creating tariffs or other trade barriers on each other in retaliation for other trade barriers.
What's more a quick search shows that researchers were using it when discussing Smoot-Hawley more than 20 years ago https://www.jstor.org/stable/2951161
So no, it's not a "new term made up as a buzz word"