No, he never said such thing and it's not showing he would kill her so soon if he wasn't enraged.
Think about it, Maul hates Obi Wan right? If someone was keep taunting him when he captured Obi Wan in the end of season 4 and he killed Obi Wan and the taunting guy, can we say "He's going to kill Obi Wan anyway, it does not matter."
He never "said" it directly but it was made clear to the audience that he was going to do it as soon as Maul lifted Satine with a Force chock. Also, you have no proof that Maul didn't decide to kill Satine before he was "enraged"(hell, was already enraged).