This website is quite bs imo. In their footprint test even if you only eat local and vegan, never interact with a vehicle and live in a well insulated fully renewable house that generates almost no trash, it still says you'd need 0.7 earths to survive (overshoot day next year may). So if you aren't the model citizen in any of those aspects you will have an overshoot day within one year.
They justify this by saying everyone pays for public and government actions, which is quite bizarre since it doesn't even ask where you live. The way it adds up land usage and carbon footprint to get the final number seems really arbitrary too.