Best answer by Max
Thank you for sharing the screenshot. The EMUI 8.1 feature applies to the P20 and the P20 Pro, which come with EMUI 8.1/Android 8.1 pre-installed. The Mate 10 Pro, on the other hand, only comes with EMUI 8/Android 8 installed. Therefore, it will only receive update packs for the 8 version, until it will be eligible to receive the Android Pie update, which will be further down the road. However, we have no information at the moment as to when that will happen.
Hope this clears the case a bit! :D