The compatibility questions, when answered by Intel, will always have the disclaimer of Intel can only recommend Intel tested reviews in their answers.
Will the SSD work with the NUC8i7HVK, most likely.
As for the notch at the top used to secure down the M.2. it's a manufacturing standard and should be part of the design, and likely underneath the wrapping.
I cannot find a single picture that shows it uncovered. You can ask the question on Amazon and perhaps someone can answer you there.