I think so because i think Evans would still be 1st (before Australia) if Suninen is only 3rd.
Because Both Evans and Suninen would have 3 1st, 1 2nd, 1 3rd and one 4th.
However, in the worst of their 7 rallyes (Portugal for both), Evans was 14th and Suninen 16th.
In that case, Lappi would only need a 2nd position in Australia to win the championship (a 3rd would not be enough).