You are correct. The slide on the right follows Design Guideline 3.

Design Guideline 3:
Make It Easy to Read

  1. Use upper- and lower-case letters (not all caps)
  2. Use sans-serif fonts (e.g., Arial, Verdana)
  3. Use large font size
  4. Use high contrast (light on dark or dark on light)

    Notes on Make It Easy to Read (PDF)