If I remember correctly growing up, I believe the thread teaching regarding God’s covenant with Israel in the OT and NT was structured this way… Yes God made a covenant with Israel in the OT, that covenant was broken over and over, and when Christ came and died and Paul ascended to apostle the covenant not transitioned, but extended to the gentiles. I never encountered the term supersessionism. I think the rhetoric of my teaching from youth up until now HOWEVER, has been yes the covenant was extended BUT it’s sort of transitioned from Jews to the gentile church too. AS if “yes God still loves the Jews BUT His covenant transitioned to the gentile church, more than them now. Almost as if it was “us vs. them” (not in dispute but in covenant) If that makes any sense? So I’d say the thread teaching and the rhetoric were different. I think for me and the western church as a whole, this rhetoric has been emphasized as covenant being transitioned as opposed to extended and not much emphasis on God’s still passionately in love with the Jews and His covenant sustains. Hope this makes sense.