Increasing Metabolism by way of High Calorie Diet?

" A high calorie diet is the next best way to increase metabolism. Consuming
mass quantities of high calorie food will increase metabolic rate by up to
10 percent. On the contrary, a malnutritious (light) diet could lower your
metabolism by 10 percent. "
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I am 5'11'' 200lbs and trying to lose 15lbs of body fat through
weight/cardio training and a clean diet. I "should" be consuming 3000
calories a day, but have held between 1800-2000 for the past 3 weeks
dropping 15lbs. If I consume the recommended 3000 a day for my
weight/height, should I expect to lose body fact quicker? This statement is
confusing to me.