I know it's small and kind of a throw-away line, but statements like this make me take this author's interpretation of the rest of these events with a healthy dose of skepticism. At my company we have multiple company "memes" like this that have been turned into reacji, but the vast majority of them are not because it's "popular" but rather because we use it ironically or to make fun of the meme. Just the fact that an employee turned it into a reacji is a total non-event and I don't think you can read anything from it.
There's not enough info in this article to know if it was seen as weird by the employees or not, but my point is that "they created a reacji of it" isn't evidence one way or the other for it being "popular".