The references I pointed to, in Mark and Luke, are not be ignored so that other teachings can take preeminence. There is harmony in the scriptural teachings. That is why Paul’s teachings to the Corinthians is further proof of the ‘Lord’s supper’ being done “in remembrance of” Christ. These people have already been baptized into Christ. The Lord’s supper is a solemn event done in remembrance of him. The chapter starts with his rebuke of the members chowing down at the church house, and shortly thereafter partaking of the Lord’s supper in a nonchalant manner. Paul ends the rebuke by referring again to eating of meals to satisfy hunger, and that it should be done in their own homes, completely apart from church service.
If it’s simply a reference to “remembrance,” Christ would not have doubled down on his teaching when the Jews who took His word literally began to leave him. You may like to pay some close attention to the earlier posts.
It would seem from your line of reasoning that not only was Christ misunderstood, but so was Paul, Paul’s teachings, and the early Church fathers. And, those leading Protestant theologians and scholars who after years of scholarship and had converted to the Catholic Church, were all wrong.