No. According to this article and this study no stress is involved for avocados. Climate change not a factor either, it was observed approx 100 years ago

Botanist A. B. Stout observed this reproductive strategy as early as 1927,

and check out the title of the actual study, link in the description

Balanced polymorphism in a floral transcription factor underlies the ancient rhythm of daily sex alternation in avocado