That chart represents the relative position of the US and all other countries with respect to asset ownership.

What that chart is saying is that countries around the world own $25T US assets more than the US owns foreign assets.

If/when those countries start repatriating capital we should expect US assets deflation. Think of stocks, real estate, etc.

I would not be surprised if the US enacted capital controls to try to prevent that asset deflation from manifesting. That would be a real, substantial blow to US dollar status.