The point and whole advantage of a bioweapon over a conventional weapon such as a ballistic missile (which leaves a trajectory whose trace is hard/impossible to fake) is that it used covertly by way of deception. It is much like malware obfuscation + mis-attribution which the elaborate 'Marble' framework was made for --- pinning blame of malware one has designed and deployed on some other country.

It seems pretty clear the Chinese were framed.

Also, another striking feature is that SARS2 seems to be tailored not only to target the elderly (since ACE2 receptors density increases with age), but to target north east europeans, and south asians via the LZTFL1 gene:

This gene is located on chromosome 3, one of the 23 pairs of chromosomes in humans, and is present in around 14% of the Polish population, compared to 8-9% in Europe, and 27% in India.

[....]

The LZTFL1 gene is present in 60% of South Asians [....]

No reason the Chinese would have designed it to target themselves.