When you scroll through a music show's channel, many stage clip titles open with a short phrase in quotation marks, such as "First Reveal", "Hot Debut", "Comeback" or "Weekly Pick Stage". The first thing to know is who wrote it. The show's channel did, not the act and not the label behind the act. These phrases describe what the stage is doing inside that particular broadcast, so we read them as the program's own editorial tag, a bit like a section heading in a printed schedule, rather than as a fact about the act's career.
"First Reveal" is the one that trips people up most. It means the show is presenting the stage as the first time that performance is shown on the program. It does not, by itself, say the song was never performed anywhere else. The act may have released the track already, or shown it at another event or on another broadcast, and the label would still be accurate for this show. "Hot Debut" and "Comeback" work in a similar way: they say the show is presenting the act as newly debuting, or as returning with new music, in that episode. "Weekly Pick Stage" is the show's own selection of a stage for the week. It is a program feature, so please do not read it as a ranking, an award or a vote result.
Because the label sits inside the clip title, the rest of the title is where you find your bearings. The episode number and the broadcast date are often right there in the same line, and together they tell you when the stage aired. That matters more than it sounds, since the same stage can show up in more than one clip on the show's channel, including shorter cuts that trim the performance down. Two clips with the same label and the same date can be the same stage in different lengths, so check the episode details before you assume you are looking at two separate performances.
Keep the limits in mind too. Labels vary from show to show, and the show's own definition of a label is not always stated anywhere you can read it. A tag also cannot tell you how the performance went; it only says how the show filed the stage. If you want the act's own release and credits, such as the release date, the people who made the track and the format of the release, the act's channel and the release notice are better sources than a stage clip. Treat the label as a helpful signpost for finding the episode, and let the primary sources answer the bigger questions.