This could be due to the API integrations (ex: Bing/Copilot) causing people to use those instead of going directly to the openAI website. Admittedly, the artic

This could be due to the API integrations (ex: Bing/Copilot) causing people to use those instead of going directly to the openAI website. Admittedly, the article was behind a paywall, so I am not sure if they address this possibility or not. However, from the bullet point that is free it looks like they just analyzed web traffic via similarweb.