I read it the same way as you did. Also, I'd like somebody to teach me what a business that serves food will do with food waste if not send it to a landfill in order to achieve "zero waste to landfill." What will they be doing with the rubber gloves that food prep people and cleaners wear? Reuse them?
The slogan wouldn't be as catchy but it would be much more realistic to say that our goal is to reduce our waste to landfill by 80% by 2030.
Can't say anything about the gloves, but apparently the foodwaste is somehow turned into bus fuel.