2) even the alleged learning from the experiment: "The conclusion of the study is that mutations in the spike protein of the Omicron variant are responsible for the strain’s ability to evade immunity people have built up via vaccination, infections, or both, but they are not responsible for the apparent decrease in severity of the Omicron viruses."
...does not hold up, because this was in mice. Ordinary lab rats were immune to the original strain of covid-19, but not to Omicron, which shows that it is not at all unlikely for there to be significant differences in the resistance of rodents to one strain or the other, compared to humans.
So, they made a hybrid covid-19 strain, that could conceivably have been as contagious as Omicron but as lethal as the original strain. Nice work, folks.