Cannot reproduce. Tested with a symbolic link.
FileNetworkOpenInformation, FileBasicInformation, FileAllInformation, FileAttributeTagInformation all add FILE_ATTRIBUTE_REPARSE_POINT to FileAttributes.
#define FILE_ATTRIBUTE_REPARSE_POINT 0x00000400
So... 0x420, as shown, would be correct.
Make sure to open with FILE_FLAG_OPEN_REPARSE_POINT, otherwise you are opening what the reparse point points to.