My impression is that the Supreme Court's significantly pared that back in further cases. Copperweld Corp. v. Independence Tube (1984) held that parallel action was inconclusive evidence of antitrust violations, though it could serve as circumstantial evidence. In Bell Atlantic v. Twombly (2007), the Court quoted that approvingly, and held that an allegation of parallel action, without a further plausible allegation of a conspiracy to engage in the parallel action consciously, wasn't even enough to state an antitrust claim sufficient to survive immediate dismissal, let alone prevail.

I'm hardly a legal expert, but I do recall some law-prof bloggers around 2007 claiming that it was confirmation that the parallel-action-suggests-conspiracy rule was dead and buried, even if not explicitly overturned.