Microsoft rep insisting there is no Volume Licensing for Win IoT

Has anyone else ever had their Microsoft rep insist that the Windows IoT product can only be purchased with a new PC? We are trying to get the product SKU added to our Volume Licensing and this was Microsoft's response:
"Windows IOT Enterprise LTSC cannot be added to volume licensing. Never has. Never will. It is an IOT OEM product only.

I repeat it: the only option to obtain Windows IOT Enterprise LTSC is to purchase devices that have it pre-installed."

Sharing links such as https://learn.microsoft.com/en-us/windows/iot/iot-enterprise/commercialization/licensing#volume-licensing and https://learn.microsoft.com/en-us/windows/iot/iot-enterprise/deployment/volume-license?pivots=windows11 is not changing their mind:

"Public documentation can help interpret intent, but it cannot expand or override contractual usage rights under the MCA / Volume Licensing terms and the Windows IoT Enterprise EULA."

So we're stuck having to revalidate our manufacturing fixtures every year or so, which is an incredibly expensive process. Has anyone else had Microsoft push back not against the use-case (ours should absolutely qualify) but the very notion that Volume Licensing is allowed at all?