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The schema of the Dogmatic Constitution on the Principal Mysteries of the Faith, drafted for the First Vatican Council (1869-1870), includes the unique mediation of Jesus Christ as one of these principal mysteries: "Truly, therefore, Christ Jesus is mediator between God and man, one man dying for all; he made satisfaction to the divine justice for us, and he erased the handwriting that was against us. Despoiling principalities and powers, he brought us from our longstanding slavery into the freedom of sons."

These quotations from official Catholic documents give unambiguous proof that the Church believes Jesus Christ and no other is the one mediator between sinful humanity and the righteous God

Which quotations in your opinion do not?

I highlighted the above and

The fifth session of the Council of Trent (1546) laid out the belief in Jesus the one true mediator as the norm of Catholic faith: "[Original sin cannot be] taken away through the powers of human nature or through a remedy other than the merit of the one mediator, our Lord Jesus Christ, who reconciled us to God in his blood, having become our justice, and sanctification, and redemption."

Can you please cite any official dogma that cites otherwise?

If not, will you not see that there is unambiguous proof that the Church believes Jesus Christ and no other is the one mediator between sinful humanity and the righteous God.