I like the mention of an internal tool called "SECRET TOOL". It makes me wonder why the name would be redacted, although I'm amused by the idea of that actually being its name.
As a Roblox user, I believe it might be their tool that allows Luau code to be stored on the filesystem and automatically synced to games. There are references to "FileSyncService" in the binaries, but the engineers refuse to open it up for some reason.