I understand you're looking for a proper, authoritative paper or guide on rooting the using TWRP 3.0 and possibly involving Google services.
The Google search had led him through dead links, Russian forums, and a $4 Telegram gamble. But in the end, the old tablet wasn’t slow. It was just waiting for someone to set it free. TWRP 3.0 ROOT Huawei MediaPad T2 7.0 Pro PLE-701L - Google