No, you shouldn’t, because telling them the truth would be contacting them, and they’ve asked you not to contact them.
Same goes with apologizing for the unwanted contact, or any other reason you can think of that it’s ok this time. It isn’t. No means no. Leave them alone.
The right thing to do in this situation is to unfollow them, block them, delete the persona you made to trick them into interacting with you, and blacklist them on xkit/tumblr savior if you use those.