You mean linear reality and objective fact? Yes, fighters contracted and fighting under Strikeforce are described as such when being absorbed to the UFC.
Are you no bullshit asking why all fighters transitioned from Strikeforce to the UFC didn't get immediate title shots?
This is an IQ test....
On average Strikeforce fighters did disproportionately well in the UFC, winning multiple titles in mutiple divisions and filling out the ranks of the top 10. It is demonstrably true the best fighters outside of the UFC are of UFC caliber. This is settled fact.