The reported throttling settings inside of the Lighthouse report don’t show the whole picture.
On the May 8th test the Network throttling was applied outside of lighthouse at the packet layer using NetEm and Lighthouse was configured to do the CPU throttling.
Today’s test ran Lighthouse in “Simulate” mode which is the default mode Lighthouse uses but is less accurate. It doesn’t apply any actual throttling directly but it models what the performance would have been like if it had throttled.
The change is because of this issue with Lighthouse that we are working through sorting out with the Lighthouse team. Lighthouse is failing in a lot of tests with Chrome 92 when using the real throttling so we switched WPT until it can get sorted out.
A few minutes ago I added another checkbox to the “Chrome” tab below the lighthouse checkbox that lets you opt to use the real emulation but there’s a good chance you will get a failed Lighthouse test if you enable it.