Archewell is a foundation not a charity.
https://www.influencewatch.org/non-profit/archewell/
A charity and a foundation are both types of non-profit organisations but there are some differences between the two. A charity is set up to provide direct assistance or support to those in need. Charities typically focus on a specific cause - like Water Aid for example or GOSH. Charities can fundraise activities directly and donations to charities are usually tax-deductible.
Foundations are organisations that are set up to support a specific cause or group of causes by providing funding to other organisations or individuals. Foundations typically have a large endowment or source of funding, and they use that funding to provide grants and support to other non-profit organisations or individuals who are working in areas that align with the foundation's goals. Foundations may also engage in fundraising activities to increase their endowment, but they typically do not provide direct services or support to those in need.
Archewell’s 990 form tax filing aligns with a foundation structure.