Não. O ponto de TODAY() é obter a data do último recálculo. IF ou qualquer outra função também não ajudará porque não há nenhuma função que armazene a hora em que foi chamada e sempre retorna esse valor
Se você precisar inserir a data atual sem alterar, então você não deve usar uma função, ao invés disso, insira-a estaticamente com Ctrl + ; (ponto-e-vírgula). Similarmente para inserir NOW() sem mudar, use Ctrl + : (dois pontos)
Insert a static date or time into an Excel cell
A static value in a worksheet is one that doesn’t change when the worksheet is recalculated or opened. When you press a key combination such as Ctrl+; to insert the current date in a cell, Excel “takes a snapshot” of the current date and then inserts the date in the cell. Because that cell’s value doesn’t change, it’s considered static.
Insert a date or time whose value is updated
A date or time that updates when the worksheet is recalculated or the workbook is opened is considered “dynamic” instead of static. In a worksheet, the most common way to return a dynamic date or time in a cell is by using a worksheet function.
To insert the current date or time so that it is updatable, use the TODAY and NOW functions, as shown in the following example. For more information about how to use these functions, see TODAY function and NOW function.
Insert the current date and time in a cell