Because he wasn’t actually talking about Lucho, he was talking about himself. He’d just found out that Lucia was in league with Johnny who had him murdered and he was projecting that into both the conversations he had with his younger, easily influenced kids, like the dumbass that he is.
Tbh, that realization made that whole scene far more palatable for me than it’d initially been. I’d only first gotten a summary of it which was of course appalling but there’s a big difference between characters doing bad things and the narrative endorsing them. What he said was terrible, no doubt. But it wasn’t Jacobo saying that as Val’s loving father he thought the best thing in this situation was for Val to consider Lucho’s feelings more, it was a very upset, self-centered Jacobo saying that about himself and Lucia.
I’m especially glad he had a similar scene with Guille because the audience already knows they should be rooting for Guille/Renata as a cute m/f pair, so their feelings of “wait, Jacobo is clearly projecting and giving bad advice” will more easily be carried into the conversation about Val and, indirectly, Juls.