No, what I want to say is that QCD is the theory correctly describing not only UV physics of strong interactions (k\gg \Lambda_QCD) but IR physics as well, i.e., it is not necessary to change the QCD Lagrangian at scales k\ll \Lambda_QCD, as lattice QCD simulations show.

However, theoretical understanding of IR behavior of QCD is essentially absent at this point.

Cheers,
Dmitry.

Is your message that we now fully understand the theory behind infrared QCD? Are you saying that lattice QCD is a good-enough computational tool and theorists should not spend any further effort in understanding the physics of infrared QCD?

Best regards,

Ervin