Actually, that verse is one that Catholics also parrot in attempting to argue against Biblical reproof of their church, even though TradCaths themselves subject the teaching of modern Rome to their interpretation.
However, the use of 2 Peter 1:20 to censure non-official interpretations is another example of Catholics abusing Scripture, compelling it to be its servant in defending their source of security, for incontext (is king), that verse does not refer to interpretation of Scripture, but refers to how prophecy was given, that it was not being the product of one's own private understanding, for indeed, "Of which salvation the prophets have enquired and searched diligently, who prophesied of the grace that should come unto you: Searching what, or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow." (1 Peter 1:10-11)
As such, it simply does not refer to reading and understanding Scripture, which the Lord actually expected and called souls to "Search the scriptures" (John 5:39), and reproved them for"not knowing the scriptures, nor the power of God." (Matthew 22:29)
However, it remains true that, as substantiated, in Catholicism a pious, devout, holy. Spirit-filled virtuous instrument of God is typically exalted far, far , far "above that which is written," (contra 1 Co. 4:6) ascribing unto her attributes, glory and titles that are never given to any created beings except by pagans, even unto being worshiped by some, despite the semantical contortions (as if only one word can denote worship) engaged in trying to deny it, and akin to the what Israel ended up doing toward the brasen serpent God instrumentally used (Numbers 21:8; 2 Kings 18:4) and the ephod of Gideon. (Judges 8:27)
One would have a hard time in Bible times explaining kneeling before a statue and praising the entity it represented in the unseen world, even with adulation, attributes, glory and titles never given in Scripture to created beings (except to false gods), including having the uniquely Divine power glory to hear and respond to virtually infinite numbers of prayers addressed to them, and beseeching such for Heavenly help, and making offerings to them. Which would constitute worship in Scripture, yet Catholics imagine by playing word games they avoid crossing the invisible line between mere "veneration" and worship.
Instead they should do what Mary and every believer in every prayer to Heaven did (and I should do more of), which was to pray directly to the Lord, not secretaries. But they must truly become born again for that.
Moses, put down those rocks! I was only engaging in hyper dulia, not adoring her. Can't you tell the difference?
Instead Caths basically say,
As for the word that thou hast spoken unto us in the name of the Lord, we will not hearken unto thee. But we will certainly do whatsoever thing goeth forth out of our own mouth, to burn incense unto the queen of heaven, and to pour out drink offerings unto her, as we have done, we, and our fathers, our kings, and our princes... (Jeremiah 44:16-17)