profile_sync --all reported 18 repositories the forge answers under another owner or name. Each pin resolves in the renamed repository, so the URLs change and the pins stay. flycast2021 builds from metallic77/flycast 603814c9 (ROCKNIX package.mk), whose upstream libretro/flycast now answers as libretro/parallel-dc with 4c293f30 still in its master history.
100 emulator names the two platforms run had no profile, so their packs carried nothing for them. Each was read from the platform's own launcher or scriptmodule: the same program as an existing profile takes the name in cores:, a different build gets its own profile read from that version, a launcher or self-contained game goes to remove_cores, and the rest are new profiles written from their source or shipped binary. The files they need that the collection lacked are collected from the upstream distributions. Bungie and splitwolf trees are read by path and stay out of dedup.
Abdessamad Derraz