It will be a different playoffs now for the Bucks as Giannis can shoot threes now.
The question is, if he will be given a good looks, their opponent knows his capabilities, last playoffs the Raptors put good defense on Giannis but putting two defender on him and sometimes even 3 and that made him struggle, so as the whole team.
This is NBA, they would be expecting this so obviously they will be making strategies amd plays that will maybe break that three defenders or making an allternative offense not focussing on Giannis. They have Korver and Hill, they can score outside and inside so I don't think that it is a problem, it is the matter of how would they be composed on that hard game.