Good call!

It looks like HR8799 that the animation is based on is about 1.5x the radius of the sun.

That being said, my silly point still holds - there are stars that are truly massive. Stephenson 2-18 is approximately the size I mentioned, which is genuinely impossible to comprehend.

There are a handful of known red supergiant stars around 15 AU in diameter, 20 AU would be pushing past the boundaries of what we believe would be possible.

The star in the video, HR 8799, is about 50% larger than the sun.