A recent article in New Scientist reports the following claim made by Wenju Cai at CSIRO Melbourne.
Southern India is having a lot of rain as it goes into winter, having come out of the dry monsoon. This is only so during extreme El Niño, so it is a confirmation that the El Niño is huge
Does the claim indicate that a strong El Nino has a causal effect in extreme rainfalls in delayed monsoons? Has there been any historical evidence to backup this claim (for example the 1997-98 El Nino data)