As the article mentions, their population is threatened mostly by habitat loss due to human development and trophy hunting
NY Times 2019: Climate change is now pushing the Bengal tiger closer to extinction https://archive.is/0qbcz#selection-553.0-559.23
NY Times 2020: India Sees Coronavirus Threat to Fragile Population: Tigers https://archive.is/PnuV3#selection-441.0-441.59
Human development and trophy hunting are threats, but they aren't the only ones.
You are arguing against a statement that nobody made.
The problem with the post is that Bengal Tiger != Indian Tigers. Bengal Tigers are a subspecies of tigers and not many of them are even in India.
The issues faced by Indian tigers was loss of habitat due to human encroachment (which will be worsened due to human migration due to climate change), whereas the major future threat to Bengal tigers, which live primarily in the low lying Sunderban areas of Bangladesh, is climate change.
So both things are true because we are talking about completely different groups of animals.