Submarine kills versus the destruction of Japanese land air

Were U.S. submarines the decisive part of the battle because they sank two major Japanese carriers?

They had a decisive long-term impact, but the immediate turning point was the destruction of Japanese land-based air before it could support the fleet.

The submarine sinkings were decisive for Japan's long-term carrier strength, but they were not the battle's primary turning point. The early destruction of Japanese land-based aircraft removed the force meant to reinforce the carrier strikes and pushed the fleet toward retreat. The submarines then imposed lasting losses on a force already deprived of its intended air support.