I believe they're referring to the fact that Uber took specific action to promote itself by canceling surge pricing at JFK during the strike, not that it did anything passively through inaction.
Lyft did not negate surge pricing that day, AFAIK.
There's an argument that that's economically incoherent - a strike is about restricting supply, and surge is about increasing supply. Turning off surge does not work against the strike.
But that's actually immaterial: surge was turned off a half hour after the strike ended.
Lyft did not negate surge pricing that day, AFAIK.