You have to consider that a person with a powerlevel of 1000 would be able to wipe out the entire population of earth if there were no other ki users around and that such a powerlevel is strong enough to blow up the moon with a concentrated attack.>>184049707
Blue Kaioken and the Broly movie are not canon to eachother and can therefore not really be compared.
You're also ignoring that while blue maybe landed a few hits here and there, MUI Goku landed dozens of unexpected, unmitigated hits to Jiren's weakpoints near instantly.
We don't know if those kinda hits would even be able to affect Broly after reaching his maximum potential, according to official sources he is stronger than any previous enemy Goku has faced.
Also this >>184049803>>184049865
It bruised his skin, which means it penetrated Jiren's ki defense to some extent.