Oh look, it's people telling you how to think and speak again! This person would be less upset if we made up a word like "mangangulus" to replace the word gameplay.
Oh, the graphics weren't very good but the mangangulus was fantastic!
It's called gameplay because that's the way the game plays. It is not The Game. The Game is the entire package.
The writer may have a point about it not following the usual rules of the English language, but so what? Plenty of people throughout history have hated certain words because they view them as silly/inferior/barbarous. Believe it or not using words such as "Lengthy", "Reliable", "Talented", "Influential" and "Tremendous" all received flak from many English "experts" such as novelists, writers, poets and other academics. People obviously got over THAT.
No one is confused. People may use it wrongly, but fuck them. There are people who get the meaning of a word way off with everything. The person who told the dev that the explosion was bad gameplay was clearly a moron. The problem here isn't with words, it is with stupid people who refuse to use the word correctly. My, we sure do love making a big deal out of nothing. Don't we. :P