Not at all. To be effective, it doesn't need to stop a very determined user (as evidence, someone reflashed the bios so they could install Linux). And it does

Not at all. To be effective, it doesn't need to stop a very determined user (as evidence, someone reflashed the bios so they could install Linux). And it does effectively stop users from installing Linux, Win7, Win8 and even Win10 - except from the provided Lenovo install media; which makes Microsoft happy (no Win7/Win8) and Lenovo happy (full control of installed versions).