Comment by codedokode

Many "undocumented" Windows kernel structures are actually documented on third-party sites, for example [1] and [2]

[1] https://www.nirsoft.net/kernel_struct/vista/index.html

[2] http://msdn.mirt.net/

They were found, for example, in debugging symbols released by MS. And sadly Axel didn't provide a single example of code that allegedly was copied.