He has covered the Tour many, many times for DR. There is no excuse. He is bad at everything he comments on.
I remember back in 2016 where he commented the Olympic Road Race and described E3 Harelbeke as a 1/8 classic (as in two tiers below semi-classics) - it was Kwiatkowski's only win of the season and Liniger had evidently never heard of the race so he was emphasising what a poor season he had had and what an insignificant win he had acquired, even though Sagan and Cancellara had completed the podium (something he obviously had no idea about). How that man has landed such a significant job for such a big medium in Denmark is far, far beyond me.
Fair enough, never watched cycling on DR, TV2 always has the rights for the big races.