Does Tianna Crownguard prevent the point gained from burning out, potentially creating an endless loop?

Ruling: Tianna Crownguard does not prevent the point from burning out. The opponent still gains the point when you burn out.

Nuances:

• Burning out causes an opponent to "gain" a point, not "score" a point
• Scoring specifically refers to hold/conquer mechanics and card effects that explicitly use the word "score" (like Windrider or Tryndamere)
• Tianna blocks scoring but not gaining points, so she prevents effects that say "score" but not burnout