I don't count people here on work/student/tourist visas as immigrants, but that doesn't necessarily mean that the article didn't when it said "around 1.4 million [immigrants] are Indians".
There are a lot of reporters out there who constantly refer to illegal aliens as immigrants, so who knows.
Are HI-B's counted as immigrants?
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My guess is 70% of them get green cards after slaving away as H1B for 5 years. The whole point of being an H1B is to immigrate here. Indians are the most numerous but other foreigners too.
My best guess would be that the 1.4 million does not include folks on visa's and this number is strictly immigrants, both legal and illegal.