All countries except the US appear to direct you to Gen4 for Windows VPS options (Gen4 has many small differences but main thing is Windows Server 2016). The US flavor of the website sells you Gen3 (with your amusing "choice" of Windows Server 2008/2012).
If you change to one of other countries (for example UK) on the GoDaddy site and then to USD, you can purchase it - and it is available in the US Datacenter.
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