This post title is a little misleading. TrueNAS continues to support SED: via the UI for specific drive hardware we validate with Enterprise appliances and using sedutil for COTS / community hardware, as the article says:
UI management of Self-Encrypting Drives (SED) is an Enterprise-licensed feature in TrueNAS 25.04 (and later). SED configuration options are not visible in the TrueNAS Community Edition. Community users wishing to implement SEDs can continue to do so using the command line sedutil-cli utility.
Hope that clarifies the situation.