Fairphone still lacks standard security features such as a secure element, and they have partially installed EoL hardware.
See also:
See also information from Tavi (Android security researcher and former developer of DivestOS):
https://forum.fairphone.com/t/is-fairphone-really-interested-in-sustainability/99302/2
If you want a secure, privacy-friendly smartphone, the best choice would be a current Pixel (refurbished models are also fine) with GrapheneOS:

