Microneedling PLLA

This study suggests there are benefits ... i'm confused as to how this could work at such a superficial level. Can anyone enlighten me and/or share personal experience with this treatment?

https://pubmed.ncbi.nlm.nih.gov/38051121/ ("Microneedling radiofrequency enhances poly-L-lactic acid penetration that effectively improves facial skin laxity without lipolysis")