Is there still Expert Calibration mode for your display in Ventura?

I'm refreshing this question as per Apple's note. And I did find the answer.

YES the Expert Mode is still there in Ventura, just hidden a bit more than in previous versions of Mac OS.

Go to Displays in Systems Settings. Then click on the right side of the Color Profile menu bar on the up/down arrows. On the pop up menu choose Customize... at the bottom.

Now hold the Option Key down while clicking the + sign at the bottom. This will bring up the dialogue box with the Expert Mode check box checked.

From there, do as you have done in the past to go through the screens and make fine adjustments. Finally, save your profile with a new name and choose it. I notice that on my LG Ultrafine 5k it shifted back to default temporarily, and does not apply the new calibration until I leave the Display panel in Settings. But then it did and all is good!