I decided to be the word geek I am and check out what you are discussing (because I didn't really notice it before).
The phrase in question:
Small fixed-blade knives have become extremely popular because they eliminate the need to “deploy” the blade in-fight.
Emphasis added, quotation marks were already there.
merriam-webster.com
1
a : to extend (a military unit) especially in width
b : to place in battle formation or appropriate positions
2
: to spread out, utilize, or arrange for a deliberate purpose <deploy a sales force> <deploy a parachute>
I can see your argument, seeing as how those definitions - especially 1b - might lend credence to the idea that one still has to deploy any weapon. On the other hand I think it was pretty readily apparent from the context clues and the use of quotation marks what he meant.
Since he was obviously not using them to attribute the word deploy to another author, he probably intended that the
quotation marks... suggest to some people that you are using that word in a
special or peculiar way and that you really mean something else (
Source)
emphasis added. Poor writing? Maybe... but not inconsistent with the message he intended to convey.
Finally - and I post all of this in a grammar/word geek way, not in a confrontational way - there is a very solid bit of evidence on M-W that that particular usage of deploy is acceptable:
Origin of DEPLOY
French déployer, literally, to unfold, from Old French desploier, from des- dis- + ploier, plier to fold — more at ply
First Known Use: 1616
Emphasis added.