Various Notes: "Why opposite?"

I didn't know the meaning of this article even though I'm reading it now.
That's no, no good. Added a note to me here.

Probably, "the previous time" is the following note.

And, "the added question" is the next sentence.
>> Excuse me, the note of this site isn't SNS, is it?

I thought I could see "or" before "is it?".
I most likely have said,
"Excuse me, the note of this site isn't SNS, (or) is it?"

Added this comment at 2024.1.5
(Modified 6 Jan. on detail expressions)
 
The following is the original of this note.

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I tried to write using a sentence of added question the previous time.

I feel there is "or" not seen in the head of that part of the added question, so the sentence seemed to ask the opposite words.

I had "Why opposite?", but I understood such.