aggressive liposuction ( which 4D liposuction is) should not be performed at the same time as a regular tummy tuck. The chances of having problems with the healing process is increased.
Some surgeons perform limited liposuction with their tummy tucks.
In my professional opinion, if you need a tummy tuck, this should be performed first and the liposuction, later.
Be sure to seek the help of a surgeon member of the ASAPS