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That’s what some people said online but yes there is ideed arb on it, there are some technical details on the /e/OS FP4 page for instance : https://doc.e.foundation/devices/FP4/install.
I was using Calyx and went to Divest with relative ease, atlhough I did pay attention to the security patch level before jumping, having to send the phone to fairphone would be really annoying.
This discussion about bricking the phone after a locking attempt is interesting, also mentioned on the Divest wiki : https://forum.fairphone.com/t/trapped-in-fastboot-mode-with-locked-bootloader-and-corrupted-custom-rom/80985/280
I just used fastboot to get the locking ability, the result was 1 so it could be locked, I did and it went ok. No problem since.