Any attempts to hijack common words for specific meaning in programming will abound with problems. I find it hardly surprising that many people view parrallelism as concurrently executing similar operations. The key being "similar operations." That actually fits with common uses of the words everywhere else.

Consider, what does it mean to run parallel with something else? Means you are running a similar path. Not even necessarily at the same time. What does it mean to run concurrently with something else? Simply that you are running when it is.