Its a sin in Italy to put pineapple on pizza. Its what is called Americanata a U.S. thing. He likely did it to promote his business. The good thing is that its pizza bianca and the pineapple is caramelized. I would taste it.I always thought there was something wrong with pineapple on pizza.
https://www.cnn.com/travel/article/pineapple-pizza-italy-naples/index.html