The of is often criticized as superfluous, a comment that is irrelevant because off of is an idiom. It is much more common in speech than in edited writing and is more common in American English than in British.
1567, in the meaning defined above
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“Off of.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/off%20of. Accessed 8 Dec. 2021.
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