They're not even 'arcade', they're just weird. I sometimes said FS19 was very post-apocalyptic in graphical style in that the sky was often way over-blown and the environment style often had over-exposed highlights and under-exposed shadows, to the point where both highlights and shadows lost a lot of detail, which takes some doing.
I'm not even sure what sort of game or genre FS22's GamesCom footage could best be compared to. A Lego game perhaps, in terms of massively over-saturated, vibrant and crushed colours? The little MF baler was almost like it was plastic-wrapped and from the video snippets you could imagine it glowing in the dark.
While also having white-sky-syndrome and a far too over the top moon glow for some reason (yes light bouncing off the moon can provide some light, but FS22's approach appears to be a massive ball in the sky that lights up everything around it).