Saying 'we don't know for sure, so we can't make decisions' is a recipe for total practical and ethical paralysis. Science never deals in 100% absolute certainty; it deals in overwhelming probability based on empirical data.
While rhizomes are fascinating, structurally complex communication systems, they do not meet the definition of information integration. There is a profound functional difference between a network that distributes information and a system that integrates it.
We have an absolute mountain of neurological, chemical, and behavioral evidence that animals experience conscious pain and suffering. We have zero empirical evidence that plants do.
If we treat the high-probability suffering of a dog and the zero-evidence, purely speculative 'suffering' of a carrot as ethically equal because 'the truth is we don't know,' then ethics becomes meaningless. We would be frozen in place, unable to eat a plant or walk on grass out of fear that it might be conscious.
We prioritise animal welfare over plant welfare because that is where the evidence of suffering actually exists.
You've moved the goalposts away from my original point of contention which was the premise that plants are as conscious as animals.
Nevertheless, your new ethical logic has some flaws: