In the Lego Batman Movie, the scene where people are outside the movie theatre, one of the movies on billboard is "THE BIONICLE M"
The title was cut off, and it's only on screen for a second, but I assume its supposed to be "THE BIONICLE MOVIE"
Or, I guess it could be, "THE BIONICLE MISTIKA APPRECIATION SOCIETY DOCUMENTARY," or something
Also, LEGO made this https://www.youtube.com/watch?v=cBE7R7DXHnk, which is a sequel to what @Rockho mentioned. It came out after G2 ends, proving that Tahu is alive /s