No they are deliberately adding GPLONLY symbol restrictions to prevent proprietary linking with the kernel, which has nothing to do with keeping a stable ABI.

No they are deliberately adding GPLONLY symbol restrictions to prevent proprietary linking with the kernel, which has nothing to do with keeping a stable ABI. They can keep the ABI as unstable as they want while still allowing proprietary linking, they don't have to provide any maintenance help to proprietary vendors who wants to link to the kernel.