I visited this tWHS in Spring 2022 on a sunny day. The royal tombs of Selca e Poshtme are currently in a pityful state of conservation and access to the site is quite complicated and out of the way as "Gradishta e Selcës së Poshtëme" on Google Maps (not to be mistaken with nearby "Gredishtë".
Huge road works were underway when I visited so I had to drive for a good 10 km on a dusty main road in-the-making full of pot holes then a further 10 km through a narrow meandering tractor road up and down the hills of Albania. Unless things improve in the meantime, I would certainly keep away in rainy conditions. Even in sunny conditions, the 5 royal tombs are visitable on a short overgrown loop. There are a few columns, decorated and rock hewn niches, stone sarcofagi and eroded capitals but pretty much nothing more. The few temporary protection offered over some of the 5 royal tombs has corroded and/or collapsed and information boards are non-existent and the little restoration made has been done clumsily at best.
A better overview of the site and what has been found there can be had at the upper floor of the National Archaeological Museum in Tirana. There you will be able to understand how the previous regime attached great importance to this site and any ancient sites for political reasons. Ever since, the royal tombs of Selca e Poshtme have long been forgotten and if truth be told possess no tangible OUV to warrant inscription on the WH list.