I think the OP in the linked thread is a complete hoax, and all the commenters are experiencing the random phantom/ghost input issues, googling it and hitting that thread. If you read carefully they all sound like their watch is receiving random inputs.
So not hoax then but scared users that need to help understand their device and it's honestly very bad bugs?
Not sure it does matter at this point, these people paid $800 and now feel their device is heavily insecure, they need help and a explanation from official side they understand.