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"Because of SQL Server’s long history on a single operating system, Windows, ..."

It did come out of the UNIX-based Sybase SQL Server, though:

https://en.wikipedia.org/wiki/Sybase

I wonder if there was an OS abstraction layer at that time (Sybase ported it to OS/2 together with Microsoft first) that was then thrown away by Microsoft after they licensed the source code and went on their own?

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There was a fairly large amount of reenginerring work around the 20000/2005 era, and a significant number of smaller but significant feature additions/changes since, and I doubt that non-windows compatibility was considered at any point during those developments.

Microsoft remade SQL Server and optimized for Win after they bought it

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