2) jokes are jokes, exxagerating a kernel of truth to the point of absurdity is what makes the joke. The truth is, the salary of prof was never anything special, but was marginally better than the salary of average worker. There were some highly (i.e. 2x, maybe even 3x?, salary scales overall were really flat) paid worker occupations, miners were one of them (maybe due to work hazard). The way to get the luxuries was not through money, but through connections (yes, mostly communistic ones).
3) shit happens (the accompanying text talks about a fire in the main/only paper-mill making toilet paper in Czechoslovakia), there were queues when the rumor spread 'there will be bananas in the local fruit&vegetables shop'. There were people panic buying toilet paper at the start of COVID also, maybe its a local specialty :-)
One anecdote I remember from my youth was people routinely taking their windshield wipers off when parking somewhere out (those were notoriously in short supply and easy to steal). So yes, there were supply problems, no rose glasses, but nothing extreme.
As with everything, there is too much polarization: some people remember only the bad stuff and it was a hell on earth for them, others remember only the good stuff and emphasize that. As always, the truth is in between.
