These terms are NOT interchangeable. RFI utilizes fluid paths in which enhanced braking mechanisms offer almost no resistance. Metering valves, proportioning valves, and anti-lock valving is designed to manipulate braking pressure, while providing minimal resistance to fluid as it returns to the master cylinder following the release of braking pressure. If the OEM bleeding instructions say to use a scan tool, you should use a scan tool. RFI does allow fluid to travel paths that traditional pressure or vacuum technique can not.
Some technicians report successful bleeding of ABS systems without the use of a scan tool.
It is important to remember that some ABS systems have a portion of the system that is isolated from the normal braking system. The most common cause for rebuild is seal exposure to other fluids like gasoline and oil. It is common for the filter to become clogged with contamination. Remove the Luer fitting from the hose and back flush the filter. Reinstall the Luer fitting in the hose.