The dread-filled I'd call this type the rational procrastinator -- you're putting off doing stuff because the stuff you have to do genuinely stinks. "If you hate what you're doing or you find it mind-numbing, it's tough to get motivated to take action," says Moran, stating the obvious.
Procrastination is a phenomenon in which a person neglects to attend to a necessary responsibility, such as a task or decision, in a timely fashion, often despite their good intentions or inevitable negative and unpleasant. Simply put, we avoid what’s good for us.
To say that perfectionism causes procrastination is not to say that one should not strive to do well, or that perfectionism is the root/only cause of procrastination. You are making a very strong statement when you say procrastination being linked to perfectionism is a myth.