I believe that you made this statement before the Barcelona vs Real Madrid in the weekend where their we're defeated by a goal difference, although the overall performance of Barcelona in the Champions League has been very impressive bit in the other leagues such as the La Liga, the club is already gradually falling behind in the number of won games.
I think his post is nothing to do with the match between Barcelona vs Real Madrid. It is true that Barcelona is dominating group H, they always win every match and be the leader of group H now. It is very obvious that Barcelona performance in UCL looks impressive so far. However, it is still in group phase, we don't know how Barcelona can maintain the good form when the group phase is over (knockout phase).
I don't want to conclude how far Barcelona to compete in UCL based on the result on La Liga. Sometimes, the performance in UCL and local competition can be different or contradictory (opposite). Although Barcelona looks dropping their performance in La Liga, how knows if they can play better in UCL.