What i am almost sure is a leftover from ski jumping is great body flexibility and ability to maintaining low weight. This is more of an speculation but some explosive power workout is likely still involved. As for the rest he said on numerous occasions different muscles are involved hence the training is different. What is known is he has a high VO2 max and AFAIK that was his initial ticket to pro cycling. After being tested for what sport he should do next. If he would start riding his bike at 12 it's obvious. He would be the next Eddy Merckx. Now he is just Primož Roglič aka Rogla aka Romy. The one and only.
P.S. His first groupset was Campagnolo Chorus.
P.S. His first groupset was Campagnolo Chorus.