It seems to be one of the old info from the times when in Wikipedia the need for sourcing them was not so pressing, simply remaining unquestioned until now. I don't know any external source that would present how the Roma have significant cultural similarities with the cultural features that the Balinese borrowed from the Subcontinent. Because of this and because it may be misleading, lacking the presentation of the common cultural features with the Indians (personally, I have in mind to add them when I'll have available time), I consider it would be appropriate to delete this statement.