The official MV can be sitting in front of you while you are still searching for the official MV. For some smaller acts, the new video appears on 1theK instead of the artist's own channel. From outside Korea, that can look like a reupload or a mirror, and the instinct is to go hunting for a better one. The upload itself tells you that you do not have to.
The receipt is hiding under the upload. In English, 1theK says its YouTube channel is also an official channel for the MV and that music shows will count views from this channel too. We do not need to guess past that sentence. It answers the question, even if the surrounding boilerplate makes it easy to scroll by.
Here is where our scroll still matters. Most descriptions use the standing block: a channel welcome, a link to a live channel, the notice and tags. None of that says anything about the song. If credits appear at all, they are packed into the video title instead, with performer names, the song and sometimes a production credit sharing one line.
The second description shape is the useful exception. Some posts swap that welcome for a three-line release card: one artist line, one title line and one release line carrying a date. When that card appears, you can keep the stated date. When only the boilerplate appears, no date has been given, and the honest path is to leave the calendar blank.