When W8 came out, Microsoft starting putting the OEM product keys in the BIOS to prevent the OEM keys on the older product key labels from being used on different PC's.
That is a violation of the OEM software terms, but no doubt thousands of folks used the XP, Vista and W7 OEM product keys from a label on one PC, for another.
With the product key being in the BIOS, it is impossible to use that key on another PC.
So...yes...since 2012 you don't need a product key to reinstall Windows if the PC came with Windows 8 or newer from the PC manufacturer (HP, Dell, Asus, Lenovo...).
You can clean install W10 by using the media creation tool, or you can use the cloud recovery tool to create a bootable USB recovery drive that will reinstall W10, the drivers and the software that originally came with your notebook.
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