Which scientist said that? Where is the published data showing the sequence analysis which demonstrates that there are "too many" inserts to be natural? Published data means a research article published in a medical journal and indexed at www.pubmed.gov; links to Epoch Times or other blogs don't count.
None of the thousands of scientists all over the world who have examined virus genome sequences have found any evidence that the virus is artificial. The genomic sequence of the original SARS-CoV-2 isolate is here: Severe acute respiratory syndrome coronavirus 2 isolate Wuhan-Hu-1, complete genome. Why don't you take a look at it and explain where and how it is artificially altered?
FYI, there is no number of inserts that is "too many." Natural mutational processes exchange nucleotides (e.g. cytosine is replaced by uracil), insert and delete sequences, and move sequences from one location to another on the genome. Viruses also exchange pieces of genome with each other. None of this is unnatural.
That’s all well and good, BUT...
A naturally occuring virus would have had numerous outbreaks with each outbreak increasing in size long before becoming a global pandemic.