Pre COVID Broncos were 3-0. After covid last year they were conceding 30 points a game. They are now conceding 26 a game. I reckon they are traveling about the same overall.
You need to look at the whole picture and get the select parts that you've used right.
Pre-COVID Broncos were 2-0.
2020 (After Covid)
Average Points Scored = 12.1
Average Points Conceded = 32.5
Average Differential = - 20.4
2021
Average Points Scored = 16
Average Points Conceded = 26
Average Differential = - 10
So in essence they have cut their average losing marging down by half. The data doesn't support any assertion that they are 'travelling about the same'.
I also haven't factored in that 50% of their games so far have been against Top 4 teams, which could arguably skew such a small sample size against them.
I'll happily predict that they will improve on last year based on what I have seen and what the stats tell me.