This is a letter signed by non-experts (albeit sometimes scientists/engineers). To me, it comes off as the climate-change denier letters or 9/11 "truthers" letters.
Please let the experts do their job. Don't spread uninformed opinions backed up by Facebook posts and panicked researchers with expertise "relevant to virus spreading" such as electronics, architecture and art history.
Be safe out there but don't let the fear and resulting panic of this virus be worse than the virus itself.