I didn't take it as offensive, Serbia have been a bit of a joke and Denmark were looking like a cohesive team, but not that special individually either, so if I were to guess I'd say it's a rather easy group.
I disagree regarding the second part though. The 2009 u21 team from Germany was off the charts, with six players starting in the 2014 WC, a truly golden generation of one of the most successful football nations. Yet they didn't exactly dominate the youth tournaments in the years before.
You see u19 tournament winners/finalists where half the team are nobodies, you see tournament topscorers who don't even have a wikipedia page.
DFB created the "Fritz Walter Medal" to award outstanding youth players (who are picked by DFB officials, and people from their youth setup as well as their coaches - people who probably know these kids quite well). You can look wehre some of our finest talents ended up and who is missing:
https://en.wikipedia.org/wiki/Fritz_Walter_Medal
Imho youth development is extremely volatile, obviously there are kids who dominate start to finish and end up as top players, but there are also tons of players who disappear along the way or make incredible performance jumps and with them their teams.