Just needs to update the site to make it clear it's an independent port of the project. Then, modify the name to MacPad++ or something. Good to go.
To be clear in the GitHub thread Don Ho repeatedly encouraged him to do this, and said it was cool that he was trying to bring Notepad++ to Mac! Just don't make it look like Don Ho and the rest of the team is responsible for any quality issues. Don't use the logo!
"Objective-Notepad" was right there.
TextEdit++ is a lot more fitting anyways.