Normal (i.e. non-sick) people don't need masks, this is good advice. As a matter of fact buying masks is actively harmful, because you are depriving people who do need them (the sick and their caregivers).
Source: https://www.cdc.gov/coronavirus/2019-ncov/prepare/prevention...
(No comment on the rest of the tweets though)
EDIT: yes, of pets and items:
> When asked, "Is it safe to receive letters and parcels from China?" [WHO] Answered, "Coronaviruses are safe because they do not survive long on letters and other objects."
> In response to the question `` whether a new coronavirus can spread from pets '', `` at present there is no evidence that pets such as dogs and cats can be infected with the new coronavirus '' is.
There is also Taiwan showing that its likely China is misleading the WHO (would China ever do that!?)
EDIT: op added "of items" to his question, dramatically changing it
Why would the WHO have any credibility after this?