[wombatmobile]

How can the question be answered without first defining "heretical"?

TFA seems to use the term to mean "mainstream" or "popular"?

I'm sure it doesn't mean "sanctioned by the Catholic Church", which is the meaning I had associated with that term before thinking about it.

[lordnacho]

Yes it seems to mean "unconventional" rather than against some established orthodoxy such as Catholicism.

That lowers the bar considerably, plus it opens it up to things that are merely unlikely: Man Utd will win the premier league this year, world war 3 will break out in Ukraine, Trump will be restored.