Re:Loss of smell could be a 'highly reliable indicator' of C...
by dhimes on Saturday October 03, 2020 @08:52AM
(#24671704)
The paper you cited doesn't supply evidence- according to the abstract it's their best guess based on experience with other coronaviruses.
The evidence is actually scant but there's a decent discussion of it in the Guardian article I linked below and the paper linked from it.
https://www.jimmunol.org/content/early/2020/09/03/jimmunol.2...
As with any pandemic there will be a small minority of outliers who experience symptomatic reinfections.