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Fairly sure ChatGPT is talking nonsense. Looking at the code, nitter looks to be calling Twitter APIs, just it's using the internal ones used by the website front-end rather than the official documented ones intended for 3rd party integrations.
That means it could break at any time but because so much of Twitter is implemented in JavaScript in the browser/app it will always have to have an API underneath that of some form which can always be reverse engineered
I asked ChatGPT and it reckons web scraping and caching: