I wouldn't be so sure until the support actually drops.
1607 is going to receive updates to 2018, and the Acer quote says "Microsoft is working with us to help provide compatible drivers to address this incompatibility", and I can see no official statement from MS saying otherwise.
The "Windows 10 is no longer supported on this PC" message, then, could be explained by simple "if (!systemsupported()) { show message }" that does not properly take into account that support could still be added in the future.
1607 is going to receive updates to 2018, and the Acer quote says "Microsoft is working with us to help provide compatible drivers to address this incompatibility", and I can see no official statement from MS saying otherwise.
The "Windows 10 is no longer supported on this PC" message, then, could be explained by simple "if (!systemsupported()) { show message }" that does not properly take into account that support could still be added in the future.