The extraction of premolar teeth very rarely causes a collapse in face profile, unless it has been carried out without proper diagnosis and treatment planning.
You are right that extraction orthodontics are still commonly practised as in Asian faces – most jaws are small, hence teeth are protruding and more crowded. Without extractions, straightening of teeth may sometimes compromise the dental health of the teeth.
The reverse orthodontics that you describe is to re-open up the spaces to ‘push’ the teeth back out. This should not be done without proper care as it may compromise the health of the teeth. It is best to get a full consultation with a specialist in orthodontist before embarking on such treatment.
Good luck!