“Fantastical” means based on fantasy: not real. A fantastical journalism source is one filled with lies.

You seem to think it means “extra fantastic.” Not correct.

It has a second definition which means something like "unbelievable in its strangeness/perfection", which can be used to imply that a real thing feels made up.

I agree that it's not a good word choice when describing a thing that could actually be fake, but you could describe a view from a mountain as fantastical even though it was 100% real.