They are counting all textile waste in the country. Not just fashion related, not just clothing, and not restricted to consumer goods.
NYT is using their typical corporatist-absolving-tone which blames consumers for the environmental evils of industry. Textile waste is not something that consumers can make truly significant impact in because the majority of what NYT is blaming on them is outside of their control. The entire premise of this article that reducing textile waste should fall to the responsibility of consumers is unfounded.
Consumer guilt can do a little bit, but they are a relatively small proportion of the problem. Reminds me of 1990s recycling propaganda. Suggesting that poor people buying cheap clothing is the cause is disingenuous at best.