I don't know how likely other accelerators are to have found the Higgs-Boson, but the article at least makes an attempt to back up its claim:
"Lower energy levels have been accessible to smaller accelerators, such as the Tevatron at Fermilab and the LEP—the LHC’s predecessor at CERN—and neither collider had found it. Perhaps the Higgs does not exist at all."
"Lower energy levels have been accessible to smaller accelerators, such as the Tevatron at Fermilab and the LEP—the LHC’s predecessor at CERN—and neither collider had found it. Perhaps the Higgs does not exist at all."