There is no source with source id 'S347'. GEDCOMPare typically does this when there is a source which is a record for a different person (such as the spouse). The ref is still added but is missing the source repository data.
Sources
↑Name: Missing source ID S347. (accessed before 13 November 2021)
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DNA Connections
It may be possible to confirm family relationships with David by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with David: