Should I delete the post now?

There were other comments on your post so deleting the post leaves those without context. But that's done now and there's no "undelete".

did not see the warning.

No worries. When I post those I'm hoping to inform those who don't know about the "dupe" warning. And it's not like it is a mandatory rule -- it's just a guideline. There are times at which value is added by posting something again.