[hgomersall]

The evidence seems to be that the cells are destroyed, not just split up: https://pmc.ncbi.nlm.nih.gov/articles/PMC9404673/

[darubedarob]

How do they prevent good cells from being destroyed on the way? Shaped sound waves adding up locally?

[hgomersall]

Yes exactly - focus at a point. You don't reach threshold pressures until you have sufficient summed waves.