Very frustrating to see Dr. Dean's work getting attacked from all sides: completely unqualified pundits like Lahren & Martin as well as scientists with no experience in epi or meta-analyses alike. Please read Dr. Dean's excellent thread before dismissing this as bad science
https://twitter.com/nataliexdean/status/1343989526503575554

The inability to distinguish between asymptomatic and presymptomatic transmission is an inherent flaw in the studies that are published, which is what meta-analyses are analyzing. If the primary studies didn't address this directly, which most did not, then that data is limited.
It does NOT mean that the study is "garbage." It means that there are still knowledge gaps about the role of asymptomatic vs. presymptomatic transmission in household transmission. Any scientist should be able to appreciate that, regardless of discipline or expertise.
It also doesn't mean the authors are stating that asymptomatic transmission doesn't occur. If Lahren or Martin bothered to read even the abstract, they'd see that this is not the case. It's an intentionally disingenuous interpretation meant to confirm political bias, nothing more