My second concern was twofold. Is the chapter about A Least Privilege Model Implementation Using Windows PowerShell published in the PowerShell Conference Book impacted by this change? Should I stop deploying Windows 10 at work because the LCU of January 2019 breaks my loopback scenario?
The answer is no and explained by the blog post Windows Security change affecting PowerShell
you would not be affected by this change, unless you explicitly set up loopback endpoints on your machine to allow non-Administrator account access
Read on for some testing and digging into what works when and why.