A few points I'd mention here:
The 'Post Notice' on your answer is designed to be a friendlier way to encourage high quality answers, and help community members understand how to improve existing answers. I would suggest the terms 'warning' or 'threat of deletion' are a bit too strong - I think the comment in it about Editing and Deletion is more to explain to newer users how the site works. It can be used as a preliminary measure ahead of content deletion, where appropriate.
In terms of appropriateness, I'd agree that the Answer in question is rather low quality in terms of its evidential basis. You've done a great job providing texts to explain your thought process, but the 'feel' of the answer reminds me of pearls on a string, where it's only the arrangement of the passages that gives the appearance of a hermeneutical argument, rather than a clear exegetical case for your conclusions.
In terms of consistency, I'd say that your answer is on a par with one other to that question in terms of the reasoning and content - it's detailed enough and so I'd suggest that 'citation needed' would be more appropriate. For this reason I've changed the notice over, and added a similar notice to the similar answer.
I appreciate you flagging the inconsistency here, but I think it's worth bearing in mind that as moderators we often are not reading every post in detail, and have to choose where to spend our time. Just because we add a post notice to one Answer does not mean that we have read and weighed every other Answer to that same Question. A post notice is a good indication that one of us has scrutinized it, but the lack of a post notice doesn't tell you whether we've read it or not. If I felt like I always had to read every Answer to a Question before placing a notice, I'd probably use them far less than I should!
Better Questions Attract Better Answers
Lastly, I don't necessarily think this at its root a problem with the Answers so much as it is with the Question. To me, this event is a symptom of a poor question, which is attracting opinion-based answers. This is a community site, and so there is sometimes that awkward balance where some users think 'this is answerable based on information in the text' and others view those as opinion-based answers.
The question is asking about information that's not explained or hinted at anywhere in the text of Matthew - we've got three different answers with different ideas that only have vague connections with other Gospel passages. I think perhaps in this case the quality of the answers is indicating issues with the Question.
If I were a user I'd be casting a vote to Close that Question as Opinion-Based, and then other people would get a vote. However, as a Moderator if I VTC, it will be closed instantly. As Moderators we do often try to give community members the benefit of the doubt and avoid Closing questions single-handedly where the community is not flagging content issues.