Huawei Honor 8 Pro - TrebleDroid/treble_experimentations GitHub Wiki

I think following thread qualifies as a proof of Treble on Honor 8 Pro. https://forum.xda-developers.com/honor-8-pro/development/rom-t3758564?nocache=1

Also, XDA also reported the same : https://www.xda-developers.com/honor-8-pro-honor-9-aosp-android-oreo-rom-project-treble/