ReactOS is aiming for 2003 at the moment. A few years back it was 2000. Then previous versions of Windows before then. It's target has been upgraded every few years. I've been following and using ReactOS for about 15 years now. Trust me when I say I'm familiar with the project and what it's aims are and have been in the past.

Yeah you're right it's not reverse engineering in the technical sense. It's a lazy term to use because it sounds like the approximation of the process even though it's technically inaccurate. I should get out of that habit. :)