Not only that they’ve got a good number of the ECFs who say Peter was not the rock.
I don't even think Peter's confession of faith, is the rock. I think Jesus Christ is the Rock:
Jesus Christ is the Rock of ages, the Rock of our salvation and the Rock that when smitten brought forth a spring of living water to quench the thirst of all men who believe on Him.
O come, let us sing unto the LORD: let us make a joyful noise to the rock of our salvation. Psalms 95:1
He is the Rock, his work is perfect: for all his ways are judgment: a God of truth and without iniquity, just and right is he. Deuteronomy 32:4
And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ. 1 Cor 10:4.
There are other verses identifying Christ as the Rock, but these are some of them.
When He told Peter, thought art Peter, He referred to himself as the Rock, not Peter. Some may not agree, but such is life. 😇🇵🇭