I would like an explanation why this question was not closed ASAP.
Why it wasn't closed earlier
This question took sixteen hours to close because not a single person - including those who flagged the Answer - voted to close it, or offered a corrective edit. Some Users took offense to the first Answer, but nobody flagged the question as having any issues, or took any action to question or resolve it.
As moderators we strive to remain highly cautious against taking unilateral action, especially in cases like this where many experienced users had already engaged with a Question and not perceived or flagged a problem. However, on this occasion the question did mention self-harm, which is a highly sensitive topic, and had solicited an answer on the same which had breached the Code of Conduct.
Why it was closed
Though it was the Answer causing the perceived issues, penalising a user for trying to fully answer the question as it was presented did not seem entirely appropriate. Considering that a full answer to the Question as-presented necessarily needs to verge onto modern application, and it was likely to attract similar answers if left Open, the fairest resolution was to edit the Answer to conform to the CoC and Close the question.
The question in its original form does not take any evident interest in the text, its original context or author, and its sole declared basis for asking is: "But many people today hate their bodies. Some even do self-harm and cut their bodies."
Avoiding situations like this in future
BH.SE is a community site and needs a community attitude to function well. As moderators we very much appreciate users flagging offensive content, and that is the right thing to do when you observe it. However, most users do not intentionally post offensive content, and often need some help understanding why there is a problem with their content. In this case it would have been better to see supportive and sensitive corrections from the community, for both the Question and the Answer.
It's hard to write good questions on sensitive topics, and for users who struggle to understand the sensitivities, I'd always recommend a healthy dose of mercy and compassion, and not just assuming that they are intentionally posting offensive content.
Honestly I don't think it warranted being closed - I don't think it so explicitly asks for contemporary application as Steve Taylor wrote. But I can see his point too, so I'm happy for it to be closed. If it gets edited to more clearly limit itself to direct exegesis of the passage then it can be reopened.
As to the content of the question, I don't think it is highly insensitive. It's true that today, as in the past, people self-harm (whether from mental illness or for religious reasons as in 1 Kings 18:28). There is an inherent tension between that and Paul's words.