SARS1 appeared in China, 2 provinces over, so quite far. And I was not talking necessarily about the Hubei region, but about the proximity of the first case to the lab: half a mile. City of Wuhan has a population of 11 million. The Hubei province has a population of 58 million.
Out of all the wet markets that serve that much population, the coronavirus just happened to appear at the market nearest to the lab studying coronaviruses. To have such a coincidence is like winning the lottery.
It's not evidence, sure, it's correlation at best. But this alone should make you investigate that lab much much better, it should be the first possible cause you research.
I am not saying this to "make China pay". After all, the US itself was sponsoring coronavirus research at that lab. But we should establish a worldwide safety standard in dealing with such research, and establish periodical inspections. Just like we do with Nuclear power plants, only better.
Circumstantial evidence is a better term. Judging the article the number of such pointing to the lab are piling up and should be hard to ignore, while those pointing in other directions are still very few.
Which ever way you frame it, it is correlation, not causation. Poor evidence at best.