Nobody was implying it does. The parent referred to Windows, Mac, GNU/Linux and developers using those platforms, with the premise being that IE needs to be cross-platform because so many more developers are using non-Windows platforms.

Which was not at all what adventured was saying.

They were responding to glesica's assertion that the reason nobody cares about IE is that it isn't cross-platform. To counter this assertion, adventured said that 90% of the desktop/laptop market uses Windows, so it seems unreasonable that the majority of people would not have access to IE as a reason for not using it.

Adventured was not suggesting that 90% of people are using IE; they were suggesting the exact opposite and asking why that is, because glesica's reasoning seems intuitively flawed.