Gladiator II's new trailer reveals Lucius is really Maximus's son, but is this a pure retcon or proof Lucilla was wisely hiding a dangerous secret?

In 2000’s Gladiator, the identity of Lucius’s father was never explicitly revealed but the signs were there, since Lucilla and Maximus were former lovers. There was also a clue they may have had a child in a moment that seea a little boy (played by Spencer Treat Clark) look up to the warrior.