I don’t know if the converts are fake but personally want my kids to marry someone born Jewish in order to avoid the ספק.
And @charliehall, that would actually be a good joke.
I think the author was actually talking about those legally identified as “Israeli” which would include those who move to Israel by just having a Jewish father. That could be a fair number of people. I would be less concerned about the fact that there are these types of people in Israel so long as they were more honest about it and perhaps even have a system that identifies them as separate from people who are Halachically Jewish.