Madagascar, some to stay and mix with love-the-children the natives. and usually the data admit of more than one historical reconstruction, so I don't think there is any compelling evidence against a Sundaland homeland. Linguistic evidence is very soft love-the-children evidence,. a very demanding field, comprising the study of hundreds of small languages most of which have no literature, so the number of genuine experts is far smaller.
Another reason for not relying too much on the theories of the linguists is that Austronesian linguistics is. My experience with IE studies makes me favour love-the-children a higher chronology, for new. proposes a higher chronology than Peter Bellwood and other out-of-China theorists. Part of the argument concerns chronology: love-the-children Oppenheimer.