I don't think omicron is not "containable". I think what is correct is that it is nigh impossible to contain it with current measures. Everybody needs to wear n95 or better masks (or respirators, etc). HEPA purifiers need to be installed everywhere indoors. If you can upgrade the infrastructure I think it can be contained.
Oh, and they should probably figure out who is contagious before they have symptoms. That's a pretty essential aspect as well. But hey, we can measure the oxygen saturation in the bloodstream without actually taking blood, so if someone can figure out a non-invasive way of screening everyone for COVID as well ...