It would make more sense that this is the moment where Tsunade will revive Naruto, in exchange of her own life.
Reason being; Naruto's heart has stopped once before, right after protecting Tsunade from Kabuto during the Search for Tsunade Arc. Tsunade did all she could to save him. And after that, her sole purpose became to protect Naruto and make sure he succeed his dream to become the Hokage. Because he reminds Tsunade of her brother and lover who shared the same dream.
She still has the seal, which probably has enough chakra to revive/heal him.