It definitely does not look like a documentary.
It sounds to me like they may be getting her projects mixed together because I do think she is going to do a docu-series or whatever about the album and all this like she did with ST but it'll be a completely separate project and not apart of this movie.
It's also possible that the exec is mislabeling what it is. It isn't a traditional film so it's hard to pinpoint what to call it; it obviously isn't a documentary - Beyonce did not blow up a building and bash a police camera in real life