Ask to be referred to somewhere else that does transperineal biopsies.
Note there are two types:
There is the transperineal version of TRUS, doesn't yet have a universal name but often called LATP (local anesthetic transperineal), which is an outpatient procedure. (This was not available in 2018, except possibly in a couple of trial centres.) It is rapidly replacing TRUS, with many centres no longer doing TRUS at all.
There is a transperineal template biopsy, which is usually done under general anesthetic, and is more thorough with more samples being taken. Sometimes used when the mpMRI doesn't give clear guidance where to sample, and most likely what your 2018 report is referring to.