Connected to the logic board? On mine they just replaced the whole top case assembly. My understanding is that the replacement swapped out everything other than the display and the logic board, including the battery.
To whatever extent it's possible for an end user to "trigger" a failure covered under the extended warranty; it's 100% Apple's fault for making it the way they did. If the keyboards could be trivially swapped (say tool less) and cheaply produced then this would be far less of an issue.
It's a bad keyboard, but it's issues are made far far worse due to the lack of a serviceable design. Hopefully this experience of shooting themselves in the foot will make them reconsider repairable hardware.