Ayewale said:
The indication is the fact that she's a giant monster who does nothing that a plant does apart from 'be green' and have the word 'Plant' in your name. Common sense dictates that she does not function like a plant.
He'd have difficulty due to how narrow the Jungle is, the vines blocking his vision, the total lack of lighting, and it being unfamiliar to him. Plus, constant danmaku is unescapable. Plantera's tentacles can cover most of the screen at times.
That's an undistributed middle fallacy. To imply that just because Plantera is a monster, she doesn't share the anatomy of a plant, which she clearly is, is a logical fallacy.
What Jungle is narrow? Vines could also serve to help him with leverage, high ground, mid air direction change, etc., lack of lightning might be a bit of an issue, the biome itself is not unfamiliar to Baki, as he fought Gaia in the jungle back when Gaia was considered a high tier in the verse.