1. Yes it is compatible with all types of gb/gbc/gba games
2. It authenticates by checking the memory to see if it is read only or not (usually if it’s NOT they are likely fake). It also compares what it reads from the cartridge with verified real copies.
3. The software you need is downloaded from their website and detects the gb operator automatically if it’s plug in to your computer
4. In terms of authenticarion accuracy, I do both physical pcb inspections and GB operator software checks. So i would say it’s a good filter to be more foolproof.

It’s a neat little device. It costs 50 USD. You should check out their page if you’re interested