"The record-breaking A. solidipes clonal colony passes the test based on a definition of being made up of genetically identical cells that can communicate, and that have a common purpose or can at least coordinate themselves."
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In this study, somatic compatibility of isolates (their readiness to fuse into a single mycelium) seems to have been interpreted as an indication of clonality – that the isolates are completely genetically identical. (At least it was by the BBC; the abstract of the linked paper, which is all I read of it, is vague on this point.) That would make the determination that this is a single individual fungus rather unassailable. But it's not clear to me at all that we can assume things are so simple.