I personally simply copied the wording in the article above and wanted to test whether the claim is true. It seems indeed to be the case that there are a bunch of people who consider the statement about "truth" more heretical than "information".

I don't know how ChristianKl meant it, but in general it appears to mean either (1) "this idea is so utterly false that it must be strenuously opposed every time it rears its head", or (2) "the crowd say that this idea is so utterly false that it must be opposed every time it rears its head, therefore I shall defiantly proclaim it to demonstrate my superior intellect".

The very concept of "heresy" presupposes that arguments are soldiers and disagreement is strife. "Heresy" is a call to war, not a call to truth.