Can someone explain why Haliburton's game winner last night wasn't a travel?

I have no skin in the game and don't care about either team. But watching these highlights, the inbounds pass comes, he grabs it in his right hand and his right foot hits the ground in a step. Then he takes two steps, jumps, and shoots. Shouldn't this be three steps and a travel? Or is this a legal "gather" step? Eurostep? Or just an example of "the NBA doesn't call traveling anymore"?