Here is the author’s personal page on the store:
There is a link that allows you to message them directly. Try that: Kindly ask them if they have any plans to port the theme.
Remember that theme and widget creators are not necessarily stable KDE community creators, so KDE cannot take responsibility for their work.
Edit: Don’t forget to remind them how much you enjoy their work! And point them to this post so they can get all the information they need.