Google was not using deep learning for search in 2011. Deep learning as a concept didn't really take off until AlexNet in 2012 anyway.
Various ML "learn-to-rank" tooling was in use at Google for a while, but incorporating document embedding vectors w/ ANN search into the ranking function probably happened over the course of 2018-2021 [1], I think. Generative AI only started appearing in ordinary search results in 2024.
