Metabolic byproducts, chemical gradients, and behavioral patterns automatically transmit information. Physical proximity creates mandatory information channels.
Environmental sharing makes communication inevitable, not optional.
And given that the organism under scrutiny is fungi - which contains many sprouting heads of the same underlying organism - one would have to have to have no familiarity with life at all to be surprised by intra-organism communication.
> The research, published in Royal Society Open Science, found that these spikes often clustered into trains of activity, resembling vocabularies of up to 50 words, and that the distribution of these “fungal word lengths” closely matched those of human languages.
I'll be the one to admit I am surprised by this (if true), even with the understanding that any motion or byproduct whatsoever might be communicative.
The thought that an organism is totally isolated from its environment, itself and other organisms is absurd, sure - but no one said that!