This paper has not actually been published yet... (The article links to a paper-like thing in "ResearchGate" -- which then suggests it may be published in the upcoming fungus issue of the journal.)
But even that journal came in for some criticism from CNET:
The real bugaboo seems to be Mr. Joseph (one of the authors), who has a really bad history of insisting he's found life on other planets, dating back to the 1970s.