Honestly not sure. Too lack of communication on this. My experience is that I had not killed lillith yet but I had killed T4 bosses. They had a patch because of Lilith sparks not dropping and I got one during that patch (still hadn’t killed her.) I have since killed her on T4 and got no spark. So I am not sure if they just gave a lilith spark to everyone and there are no tormented boss sparks this season, or they gave me one for killing tormented bosses and Lilith is still bugged.
I just don’t know and there isn’t any communication on this that I have seen. One thing I can tell you is there is a spark for completing the season journey.