“And, again, quite a tortured exegesis of discerning the body to avoid the real presence in Holy Eucharist.”
If you read I Corinthians 11:17-33 - the entire paragraph and section concerning the abuse of the Lord’s Supper - instead of wresting just a single verse out of that context, you will learn that Paul is writing about exactly what I stated.
BONUS: if you read the paragraph and particularly the individual verse in Greek, you will have additional confirming insight.
Of course Paul talks of examination of conscience. Examination of conscience is required for confession and the Sacrament of Reconciliation is integral to the Sacrament of the Eucharist.
To substitute it for discerning the body of Christ is the error.
We have the real presence in Holy Scripture, in the history and practice of the Church, in the writings of the martyrs and Early Church fathers...
We even have it after the reformation until the sixteenth century and Zwingly.
Those who follow this error have lost the discernment of the body of Christ. And Paul warns against this.
To not realize the real presence in the Holy Eucharist requires errors of interpretation, ignoring history and following a false tradition.