The accuracy of Defillama's stats depends on the data that is used to generate them. While Curve.fi may have accurate data for 2022 fees of $45.9m, Defillama's stats may be higher due to the fact that it is using data from a larger pool of sources. For example, Defillama may be using data from a variety of exchanges, wallets, and other sources to generate its statistics, which could lead to a higher number than what Curve.fi is reporting. Additionally, Defillama may be using more up-to-date data than what Curve.fi is reporting, which could also lead to the higher fee number. Ultimately, the accuracy of Defillama's stats depends on the data that is being used to generate them, and it is important to ensure that the data is accurate and up-to-date in order to get an accurate representation of the fees.