The latest AMD-without-PSP is significantly more powerful than the latest Intel-without-ME - and there are AMD platforms supported by the opensource coreboot BIOS. Actually, we have been discussing one of them - Lenovo G505S - here: Lenovo G505s - #5 by mike_banon . Quad-core CPU, 16GB RAM, no PSP, works fine with Qubes (i.e. because IOMMU is functional with coreboot), and thanks to coreboot you can be sure there are no backdoors in BIOS.
G505S laptop (as well as A88XM-E and AM1I-A amd-based desktops which I also have, and KGPE-D16 server) - is a stable coreboot platform, and without any PSP at all 
So, there are no hardware backdoors that have to be neutered (and theoretically could somehow recover from this) , and nothing to worry about 
To answer your question - no, there are no new additions to that coreboot/libreboot-capable no-ME/no-PSP list. Moreover, the situation has slightly deteriorated, by that these no-PSP AMD boards got dropped from coreboot master and now we are forced to use the slightly outdated coreboot from November 2022 if I remember it right (that’s until we come up with a list of git reverts, to be applied on top of coreboot master, to restore the support for our boards and still enjoy the latest coreboot)