Answered May 6th, 2019

Giannis Antetokounmpo is the first Bucks player to post at least 35 points and 15 rebounds in a playoff game since Kareem Abdul-Jabbar in 1974.

who was the last Bucks player with 35 points and 15 rebounds in a playoff game
Interpreted as:
Who was the last Bucks player with 35 or more points and 15 or more rebounds in a playoff game?