Since I haven’t installed macOS 26 on my machines yet, I’m unable to verify this myself. If anyone has Xcode 26.4 Beta installed, could you please check the actual Swift version and share the output of:
swift --version
If the release notes are incorrect, I’d appreciate it if someone from Apple could clarify or update the documentation to avoid confusion for developers.
FYI, the data on xcodereleases.com is generated by looking at the Xcode.app install itself; SDK versions are extracted from support files, and compiler versions come from running the --version command of the relevant executable.