Same attendance as the three non-Magic Kingdom Disney parks in 2019. They don't do that by being a sideshow to Disney. They had more visitors in 2019 than Yellowstone, Yosemite, and the Grand Canyon combined.
Is Disney World more popular than Universal? Absolutely. But the numbers speak for themselves. Universal's Florida Resort is one of the largest attractions in the U.S. with or without mention of Disney World.