People need to re-sign their releases and include the newer version of bootloader, more or less.

Yes, though noting that since the antirollback is apparently implemented by the bootloader itself on this Qualcomm SoC, this will blow the fuse on devices where the new version is installed, so the unofficial EDL-mode tools that the community seems to be most concerned about will still be unavailable, and users will still be unable to downgrade from the newer to older custom ROM builds.