Earlier quoted context omitted.
Not sure if you read the article, but both you and the redditor you are describing fit archetypes explicitly called out by the author.
Which one? "Partial Deniers" I guess? I think that's the overwhelming majority of people, those that recognize that emerging problems exist but do not predict they will cause a global collapse of society. Although it's often difficult to judge, exactly, since collapse evangelists tend to be rather evasive and ambiguous about what exactly will trigger the collapse.
I would say that most upper-middle-class+ educated westerners fit into the "partial denier" archetype, yes. It's in human nature to deny something bad is happening until its too late, and sometimes even then (see, eg. global warming, COVID-19, etc).