I think that Matt said it best here when he said "readers seeing your post for the first time, don't need to see which part was in the original post, and which parts were added." Granted he was talking about edits to the question that were done for other reasons, But the point is made clear that Stack Exchange sites are not forums and I would take it a step further and say that you shouldn't respond to answers by editing your question, we have comments for a reason.
If you have other, on-topic, questions that you would like answered additionally, create a new post with updated code so that they can be singled out and reviewed appropriately.
But that isn't the point of this conclusion statement, it appears after reading it several times that it is an attempt at steering future reviewers away from reviewing these specific aspects of the code which will only hinder the reviews that the OP will receive.
Again, don't respond to answers by editing your question, that isn't how the site is supposed to work
Finally, does it take the question to the limit of making it off-topic, not really. I would just call it bad practice.
In Conclusion: After Finally reading the Bold print of the entire post, I realize that this may be the way that the poster asks for a review of certain aspects of their code, the tone or style of their writing. The finality of the conclusion now feels like an accolade to the answer poster while also trying to engage them in further discussion about the specific aspects that have been called into question, which should be taken to Chat