Perhaps they could, but it would seem to me that, if there was anything specifically about Jesus, that fact would have been prominently mentioned. Since it is not mentioned, I think it is a reasonable assumption that it is not there.
Since story appears in the China Art News I'd suspect they picked the sample included, instead of Prof. Weifan. I would doubt that much of the staff are over-zealous about anything Christian. The Art News may need to publish the find but certainly don't need to publish evidence of the conclusions.