From what he talking in video.
"Something we unable to address yet (YET!!!). Because PDO is a new feature (time ago it really was a “new feature”) and what needs to happen is to be PDO render during main dynamic shadow pass and apperently it’s a not trivial thing but lot of people asking for it… "
Jan 8, 2016
2016 Carl !!! Today almost 2021… Too much not trivial I guess. Real time ray tracing already here we couldn’t even imagine in 2016. But this thing still same.