'House burping': What is this German habit and is it good for your health?

"House burping" is the latest thing cluttering people's feeds: short clips of people flinging open every window and door, announcing they're "burping" their home to get rid of stale, germ-filled air. Behind the playful name is a serious question: does this actually make a home healthier, or are people just swapping indoor germs for outdoor pollution?