Of course you can believe what you want. But it‘s an obvious fact that for all products not all specs are „published on Apple‘s website“, so you absolutely cannot „trust“ them to be complete. Also, DLC is a proven process and the „cost“ is a) minimal and b) smaller than to develop another, completely different process. So Occam‘s Razor says it was and still is DLC.
At this point, you can either trust Apple not to do something dumb like suddenly dropping DLC for no apparent reason or wait for a few weeks/months to see if there are numerous forum posts about the new black/grey Watches getting scratched easily (if that should satisfy your concerns) or just cling to the published specs and get something else.