This article seems to focus mainly on Western civilization. Not saying they aren't wonders. There were many engineering feats in the South/East Asian subcontinents that are not covered.
Support for linux was there, since the very early days of Azure. But at the time this was clearly Nadella's baby. AWS was running away with market share, and Azure gained some decent marketshare, at one point they said 25% of Azure revenue was on Linux, this was about 5 years ago or more, that can only have grown to now. No one lays that credit to Ballmer.
Microsoft's documentation wouldn't even acknowledge the present of Linux, I kid you not, till maybe 2012 or so. For example, pathnames like "My Folder" (spaces in folder names) - which are a no-no on any kind of server code (leave alone the block letters). This was as someone pointed out, Gates, since he was the tech architect (and hated linux or feared it ). In a sense, Linux rescued Azure, and Microsoft. Quite ironic, today we see Gates smiling (cluelessly imo), but Window's is still not a good environment for development - be it C# (a fine language), or Web. My colleagues on Windows struggle to run any Python code - all you need to do is git clone, followed by Pip install - that's still a challenge comparatively on Windows.
Ballmer hated Linux & open source. He would've driven their cloud division to the ground trying to sell Windows servers in the cloud. It would've taken him another 20 years to accept that Linux was key to the cloud. VSCode (Visual Studio Code) - would never have taken birth. Microsoft survived and thrived once Ballmer had no option but leave.
In this era of Python development, Microsoft Windows still feels a step or two behind as far as using a Windows laptop for coding in the cloud. Python is the language of AI - not Asp.net, not C#. Ballmer would never have seen the writing on the wall. He would've pushed something wierd, like VBA .