Speaking of the "variants", it might be that the original covid was from wuhan and was deadly. But it wasn't transmissible quickly. So most deaths occurred where it was "let go" (i.e. Italy, NY, West Coast, etc). Then, Delta is from the vaxxed, who were made into walking-labs, spreading their variant.
Now, we have the omicron variant, which is a mutation of the original wuhan virus and (in the normal course of virus life cycles) gets weaker and more contagious. Or...omicron is the weaker-variant of the vaxx-delta-variant. Either way, this would explain why the omicron is "engineered" because it either came from a wuhan lab or it came from the pfizer/moderna/JJ vaxx labs.