Answer is in the article:

[That would have been even more work, because there was at the time no infrastructure in Setup for having 32-bit-only components. (And then automatically uninstalling it when WOW64 was disabled.) And besides, all the people who criticized Windows 96 as "not really a 32-bit operating system because it has some parts in 16-bit" would use the same logic to say that 64-bit Windows is "not really a 64-bit operating system." -Raymond]

Yup. All you've got to do is copy it over from a Windows XP machine, if you have one laying around.

Aside from the explanation others have quoted, I'm guessing some of it was also an aesthetic decision. They could probably still go and bring it back using WOW64, but it still looks like a Win95-era program, whereas all the other games have been replaced with better-looking rewrites. That and I think it only supports a resolution of 640x480.

same question was asked and answered in the comments of the original article.