We haven’t won our group since 2012. Since 2010 we have come second to teams like Shaktar Donetsk, Schalke and Dortmund.
We have been knocked out by clubs like Monaco.
We once topped our group against Olympiacos, Standard and AZ (mindblowing I know).
We have always had fairly easy CL groups since the switch to the Emirates.
And by the same logic you are using it could be argued we wouldn’t have topped our group against Seville or wouldn’t have beaten Porto 0-5 at do Dragao.