Suplido comes from the verb suplir, meaning "to replace" or "to substitute." It's a less common word than reemplazar and carries a slightly more formal or complete sense of replacement.
In the song, the lyric "Claro que si hay alguien que te ha suplido, Ella es la culpable de mi olvido" (Of course, if there's someone who has replaced you, she is to blame for my forgetting you) uses suplido to emphasize that the new person has fully taken the ex-partner's place, leading to complete forgetfulness. This makes it an interesting and impactful word choice.
Saul El Jaguar Alarcón's "Que Te Quede Claro" is a super direct message to an ex, making it absolutely clear that the singer has moved on and is much happier. He doesn't hold back, stating, "Claro que con ella hago el amor" [Of course with her I make love] and "Claro que lo hace mucho mejor que tu" [Of course she does it much better than you]. Ouch! He's not just saying he's with someone new; he's emphasizing that this new person is a significant upgrade.
He continues to drive the point home, repeating, "Claro que con ella estoy mucho mejor" [Of course with her I am much better] and even thanks the ex in advance if they just stop looking for him: "Que si tu ya no me buscas, Te lo voy a agradecer" [If you don't look for me anymore, I'm going to thank you]. It's a blunt, no-nonsense breakup anthem that leaves no room for doubt about his feelings or his new relationship.