When you want to know more about a subject, say the history of Britain, do you read books on how to learn the subject, or do you read books on British history?
I suspect that all of you would say that you read books on the subject. So why do some people think that reading books about writing, or going to a creative writing course, is the only way to learn to write?
When we read a novel we are also learning how to write, about plotting, pace, characters, story etc. In other words, reading is part of a writer's work.
Remember that little piece of information whenever someone tells you to stop reading and do some work.