If you remember Benson Leung when Nexus 6P and the Nexus 5X was launched last 2015. During that time he posted reviews from type c device chargers and adapters that were available on Amazon.
Those information where in separate to the real type C accessories from the compliant to non-complaint, it was done in order to help buyer avoid buying those non compliant products that may damage the device.
And following up his latest review, Google engineer pointed out a previous Type-C ex-plainer for it to suggest that both LG G5 and HTC 10 were out of spec.
All information goes back to the last ex-plainer that links the published article last November of 2015 which states that if a certain device or device charger that uses Qualcomm’s Quick-Charge technology and the device was not compliant with true Type C. He says that Type C device specifications then “forbid” Type C coexisting and QC.
Since both G5 and HTC 10 support the QC 3.0, neither of those devices should be a compliant with the Type C, despite having its Type C shaped device connector.
Meaning, your LG G5 and HTC 10 G5 might charge really fast, and may have fancy reversible connector, but technically they are not a Type C device compliant.