Serruya has been replying on Twitter:
https://twitter.com/CrisSerruya/status/1097903134108774403
Seems to place the blame on a ghostwriter hired from Fiverr:
> I'm deeply sorry. I'm taking down works I did with Fiverr ghostwriter that contains plagiarism. B assured I'll fix this w/ damaged authors. I'll not eschew my responsibility + I'll prove my innocence since my entire career is in peril @courtneymilan @romancewriters @TessaDare