Originally posted by aaacb I'm guessing it's stray light from the ovf during long exposures that gave it away.
The story I heard was that the same picture was seen on a photo sharing forum, with the poster saying it was taken with his Nikon D850. It is not clear whether the photographer gave/sold a copy to Huawei and also posted it to that forum, or whether Huawei simply ripped it off the forum. Either way it was stupid. Surely Huawei could have commisssioned a photographer and retained exclusive rights to the picture? Perhaps they did, but then the photographer broke the terms of his contract.
These days you can take an image (like in Huawei's ad) and let software do a search of the internet for any other copies. So you cannot get away with that sort of cheating these days and the Huawei marketing droids (or the photographer, as the case may be) ought to have known that.