I mean kinda yeah. No doubt the character would have been portrayed differently had there been input from someone of Indian decent. Besides that its a general rule in good comedy to not punch down. If you're going to have jokes about a minority culture then it needs to be that culture making jokes about itself. Relatively few people were outraged about the Black stereotypes made fun of on The Boondocks because the vast majority of people involved in creating that show were Black. In the case of The Simpsons, it was just a bunch of White guys sitting around writing jokes about Indian stereotypes and making a silly voice.