No snopes says:

Although we couldn't determine with certainty whether this claim was accurate/authentic, we observed it had at traits often indicative of misinformation:

The account itself later referred to the tweet as a "shitpost," which is a post that is deliberately absurd, provocative, or offensive, according to Merriam-Webster.

Using the Internet Archive, we found the viral image in a since-deleted Reddit post from April 8, 2023. The post was titled "MRI to CT." The caption included in the post claimed the patient said they didn't have metal on them, but that the material inside the butt plug had metal balls.

The screenshot of the text wasn't included in the post. We could find no social media posts about the claims that came from anyone with the name mentioned in the text as the lawyer representing the person.

They further point out the fda report predates that post by 1 day so it could be inspiration for the joke or maybe real but no confirmation and then explain a bit about MRIs.

So basically they can find no primary sources, lots of evidence of a lie, but no primary source claiming to have made it up.