You claimed that Windows NT was VMS with modifications. That's not what Russinovich claims - he claims that the internal design is very similar to VMS, and thus NT's design was most likely heavily inspired by VMS's. "Architectural and design influences" is the strongest claim Russinovich makes in the article as to the link between NT and VMS.
In a similar way, Microsoft Word no doubt has "architectural and design influences" with Bravo (thanks to Charles Simonyi), but it would be false to conclude that Word is "a modified version of Bravo".
In a similar way, Microsoft Word no doubt has "architectural and design influences" with Bravo (thanks to Charles Simonyi), but it would be false to conclude that Word is "a modified version of Bravo".