And what is the probability that this is not just a third type of major coronavirus, but in fact a secret bioweapon?
Knowing how commonly there are arguments about mixed up samples in the biolabs friends work in, I know where I would place my bets.
If both virus infect a cell simultaneously, there is a small possibility that something like this happens. I think it's so small that is not possible to do it in a laboratory even on purpose, and definitively not by accident but IANAB.
It is easier with other virus. For example mixing variants of flu, because they have (IIRC) 8 strands of DNA. There are avian, swine, human, others flu, and each of them has many subvariants. If some animal get infected with two variants at the same time, a cell may have a double infection and the viral offspring may have a mix.
But the mix is a mix of the strands of DNA, like 3 swine flu + 5 human flu. This is usual, but you must consider that there are millions and millions of animals in the wild and farms. It's more difficult to do it in a small lab, but IANAB.
The main difference is that the article claim that the usual coronavirus and the HIV parts are in a single strain, not a bunch of strains packed together.
China is not very reliable in gdp (one top guy told us to look at the electricity and we look at pollution). It is very hard to get stat.
So far touch wood no one died outside of China. The death rate should not be high unless the alternative saying hiv death rate after 1 month is 0%.
The conspiracy theory in a proper sense is accidentally leaked for an experiment, like sars virus leaked (later and during study) by Beijing level 3 lab.