It doesn't say anything about lowering AP acquisition now since the game interface and definitions has been tweaked and improved. But back then the Viking Lore's skill definition was "Raises max HP/ATK. Lowers AP acquisition."
Viking Lore does not show the effect description "lowers acquired AP" anymore. So does that mean it now just raises max ATK/HP? or it still has the "lowers acquired AP", just hidden?
The AP lowering does appear to still be a thing. I quickly tested this on one of the new maps that had a single unit (7-2-3)and attacked with Yerma from the same position (attacking from the side). With Viking Lore (Maxed) she went from 18 to 34 AP while without it she went from 18-39 AP. She has Job Crystal attached so it's a bit higher than normal gains either way but there is still a difference