Totally untrue based on footage shown. For the record, the campaign flyover wasn't the only thing from the campaign, so too was the cutscene. But I'll only focus on the campaign flyover.
Did they show enough? No, they did not, and that's a fair take from you.
But what was shown is head and shoulders superior to what was on display in the 2020 gameplay.
Texture quality, atmospherics, environment ranging from foliage to trees, grass all looked better. Mountains and far off detail such as fog simply looked better, lighting was way better, the fog looked solid, no pop in like before.
It also did say in-engine footage, and the context of what that means is up for interpretation, but I don't think they would risk a backlash from an inaccurate representation of the game this late in the game.