We're about as confident that people gain long-lasting immunity as we are that it's a simple respiratory tract infection. It's not beyond question, but to raise the questions without mentioning that we're pretty confident in the consensus answers is either misinformed or misleading.
For some people any statement which is not their preferred taste of doom, disaster and panic is considered misinformation. The post they are complaining about doesn’t even supply a concrete statement:
> These are people who could potentially go back into society
Nobody knows if they could go back or not but the statement that they might is somehow the most dangerous form of misinformation.
Is a pretty hard line to take when all the facts are evolving and we’re learning more every day