The point is that the author would not really be much happier if Microsoft had added a few lines admitting substantial portions of code were taken from Spegel. They probably will do this, but I doubt he will be satisfied with the result either way.

The comment above, which I mostly agree with, is that the point of the MIT license to permit anyone, including large corporations, doing this kind of thing. Since this doesn't seem like an outcome the author is happy with, maybe a different license would be better.