Interesting. I'm actually able to use Next to navigate this page. The highlight ring isn't well aligned, but I'm able to navigate. Can you give this a try again and let me know if it's still not working for you? I'm on 53.0.2764

Note: when I use Next to expand a section, I get no spoken feedback saying that the content is expanded. David, adding some sort of alert might be helpful for expanding / collapsing content. 

Did we audit this page in the past? The state announcement of that expand collapse button should have been an item on the audit.

As a workaround, I use this System CHrome extension, which is a lot more accessible with CHromeVox Next:
https://chrome.google.com/webstore/detail/system/ocjnemjmlhjkeilmaidemofakmpclcbi?utm_source=chrome-app-launcher-info-dialog

in M53 I am able to navigate all parts of chrome://system with ChromeVox Next.  Please reopen if there's still something missing!

1. THEre are some expand all/collapse all and expand widgets, but it's not clear what they're associated to. Might it be possible to use aria-labelledby or aria-describedby to provide more context?
2. GIven the system info is using a layout table, its' a bit difficult to traverse using linear-nav. WOUld it be possible to set role="presentation" on the table, so it's more cvox2-friendly?

Other than the 2 above, chrome://system is a lot more accessible than previously.