That statement is a bunch of nonsense when it comes to art and especially when it comes to sacred art. below the video are two pictures that demonstrate the imbalance caused by modern art in a church built in the late 16th century.
Here is a great video by Robert Florczak from Prager University that gets to the heart of the matter.
The Gesu in Rome was opened in 1580. It has a beautiful altar built in the mid 19th century. The first picture demonstrates this beautiful altar and sanctuary marked off with the green marble altar rail. Outside of the altar rail and in complete contrast to the church’s architecture is a tasteless free standing altar that looks as if it were some space junk that fell through the ceiling.