You are so right, lawn clippings ect. above the ground is not thatch. What you were sold was what I call "power raking". Thatch is below ground level and requires a vertical mower, like you can rent from Home Depot. There are some small machines you can buy on line advertised as dethatchers but if they do not include a scarfier blade they are only power rakes. For about $20 you can buy a blade for your lawnmower with replaceable plastic rake fingers that works well for power raking.
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