I went there this afternoon to check. Yes, indeed, I saw two lilies in full bloom there. Unfortunately, they are not Benguet lilies. They are Taiwanese lilies or Formosa lilies (𝙇𝙞𝙡𝙞𝙪𝙢 𝙛𝙤𝙧𝙢𝙤𝙨𝙖𝙣𝙪𝙢). You can tell by the significant streaks of the color purple on the outside of the flower.
According to a study on the Benguet lily published in 2023, the Benguet lily has pure white flowers. Check out my previous post about the Benguet lily to compare photos. The researchers also mentioned that Benguet lilies "are found only in stony and gravelly soils and never in red oxide soils". Mount Yangbew has red oxide soils.
The Benguet lily and Formosa lily look very similar to each other. So mistaking the more abundant Formosa lily as a Benguet lily is a very common mistake.
The study I referenced above was by Jennifer Paltiyan Bugtong, Rey Lumpio, and Jones Napaldet. The title of their paper is "Morpho-Anatomy and Mathematical Modelling in Lilium philippinense Baker from Cordillera Central Range, Philippines".