I have previously posted how I got to experience enemas in a hospital in Rome between the ages of 4-8, back in the mid 1970s, during the time when it was the standard practice to give one prior to surgery.
Regarding those hospital enemas, those nurses never pre-lubricated my anus before nozzle / colon tube insertion, and neither did they do it to the other boys who also received enemas at the same time as myself.
Currently, I work in a hospital as a nurse assistant as I am called here in in Australia. This classification includes the duties of an orderly, but it also involves specifically assisting the nurses with patient care and management including helping patients with their ADLs (Activities of Daily Living = showering, toileting, dressing, feeding). As such, on several occasions I have witnessed and assisted nurses whilst they administer enemas (fleets) and suppositories, and I have noticed that anal pre-lubrication is not performed. Only the enema nozzle / suppository is pre-lubricated before insertion.
So, regarding the practice of pre-lubing the anus prior to nozzle insertion, and the associated question as to whether it was and/or is still practiced, it is not for me to judge what some Zity members express on the subject. Although, from personal experience both as a patient and a healthcare worker, I can testify that it is not practiced in the healthcare industry - at least not here in Australia.
If anal pre-lubrication prior to nozzle insertion was and is still practiced, I believe that this would be more so something performed in a non-clinical environment.
On a related topic, speaking from personal experience, it is worth noting that obviously anal pre-lubrication is required when performing per-anal examinations on the prostrate and for hemorrhoids among other things.