O-7 - 55% of pre-January-2020 cases were Huanan-market-linked versus 8.6% of later cases
The declining market-linkage fraction over calendar time is the paper’s key exposure statistic. It is a genuine feature of the line-list, but the exposure ascertainment actively sought market links and the early curve is under-ascertained (see the ascertainment argument on this observation).
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Why this is evidence
H-14/H-15 read the high early market-linkage, declining over time, as genuine early concentration at the market; H-19 reads it as inflated by market-focused case-finding. At face value the pattern favors a causally-central market (H-14/H-15) over the artifact reading (H-19); the attached ascertainment caveat is the counter.