This is a bit of a contrarian view of things as we have heard often repeated that spot reduction isn’t possible. Apparently the group had performed a different study in the 90’s (per note below)

“:As a matter of fact, we demonstrated that a Mixed Circuit training (MCT) induces greater total body fat loss and an improvement of metabolic variables compared to endurance
training [32,33] but, except for our pilot trial in the 900
s [34] no one analyzed the effects of a
MCT on regional fat loss”

The mechanism of action has been hypothesized as below

More recently, Stallknecht and coll. [19], hypothesized
that exercise on specific muscles may induce “spot lipolysis” via an increased blood flow
and release of fatty acids in the SAT nearby the contracting muscle regardless of exercise
intensity

https://pubmed.ncbi.nlm.nih.gov/33917584/

The workout (note: spot reduction workout on left, traditional control group on right)

Also the Stallknect paper