I didn't delete the question, nor did any moderator delete the question, but the answers don't seem to follow the guidelines for a good subjective question as listed in our FAQ. The back it up rule seems to be missing from the answers, and the material in the answers can be found in a much more comprehensive format in the linked duplicate.
I closed the question because, from my perspective, it appeared as if things were going in a direction that wasn't good for the site, and the question was missing some details that would have helped differentiate it further from the linked duplicate. When I closed it, I left the following comment on January 11th:
Hi demonz, welcome to the Workplace Stack Exchange, the Q&A site for questions about navigating the professional workplace. Please check out the duplicate post as there are a lot of outstanding answers there, and we're just repeating the same things in the answers here. If you find that none of those solutions answer your question, please edit this post with what you've tried, why it isn't working, and why the other answers don't help your situation, and we can reopen this post for new answers. Good luck, and welcome! :) – jmort253♦ Jan 11 at 3:44 edit
The post was edited once after that point to add in the clarifications in small font, but other than that, the post has had no other edits since that point and was finally deleted today.
While I can't say exactly why the three users deleted the post, my guess is they didn't see much value in keeping it around, considering it wasn't getting edited and improved. I'm not sure I would have deleted it myself, at least not without waiting a bit longer, but I don't feel there's enough community support to warrant unilaterally undeleting it.
My suggestion is to convince 3 of the 40 undelete voters to undelete the post. Explain why you think the post has value. You might also explain your plan to turn it around through editing as a means of convincing others to help out.
The nice thing about community actions is it takes numbers to get things done, which means there's more distributed energy to invest into turning something so-so into something great. Hope this helps answer your question.