Translation: I clicked the site and read that they are applied with 3M adhesive. Do those even conduct heat? If not, how will the heat be transferred to the fin?
Even if they do, look at the surface area and compare it to the surface area of a well known "actual" heatsink product like the Hyper 212. It's de minimus.
By the time you buy enough of those to do any good, you've spent what it would cost to just buy an amazing heat sink for $30 that actual works significantly.
Sorry, but this product reminds me of the car mod world where everyone is selling "grounding wires" for "lower idle and smoother throttle response".