Definitely yes. There is also a technique to which you need to get used to - when walking on exhalation, strain the abdominal muscles. Gives some tone to the abdominal muscles.
Yes, it helps, because over time you get used to constantly keeping the abdominal muscles in a relaxed state. But this exercise does not burn fat. Diet burns fat. And vaakum helps your abs look better, because with tense muscles, your internal organs do not "bulge"