Win 10 let's us do Workplace Join which can let us upgrade and activate an edition upgrade from Windows Home or Windows Pro to Windows Enterprise. This let's folks use their home computer but still use things like Bitlocker and DirectAccess which aren't part of Home. The way it works is we provide an edition change package, look up the Windows 10 Provisioning Package. Rather than relying on your home computer talking to the on-prem KMS, it uses essentially an old school MAC key for temporarily activating an upgrade. Once the PC is removed from the company's workplace join, it removes that edition. The goal is to let employees use any device they care to in order to get their work done and allow the company to reclaim that edition upgrade once they leave that role.
Why MS insists on calling it a subscription, I'm not sure, but it probably has more to do with the fact that to have the Enterprise version, you have to have an EA agreement and a Software Assurance. Basically no, it's not what you think and the Microsoft response is reasonably accurate it's just the word subscription that should be replaced with the word "Activation."
[Note, I'm a consultant who does Intune/Configuration Manager so I'm actively deploying these packages that do this with clients today.]