The NBA will not replay the last 0.3 seconds. That makes absolutely no sense at all. There was an instance many years ago where they replayed the final minute of a game because they mistakenly disqualified Shaq from the game despite Shaq having only 5 fouls. That absolutely had the potential to affect the outcome on the floor. But the issue here, whether NBA were to rule that the tip occured (a possible ruling) or that Lee held the ball too long (a very unlikely ruling), would be moot. In either case, the game clock has run out before the shot, therefore the game is over. You don't pretend that the Grizz are the 1972 Russian Olympic Team and keep giving them more and more chances to score. Either Lee's shot was good, or it did not get off in time, and the game result depends on that and that only.
Most likely, the NBA falls back on "non-reversal of a judgment call" to keep the result the way it is. But the only logical remedy that they can take, if they choose to take one, is to reverse the game result.