Since Sankaran Advaita is the primary purvapaksha for Visistadvaitins, the association of Yadava with "Advaita" is really an outcome of post-Ramanuja / post-Vedanta Desika rivalries between Visistadvaitains and Nirveseshadvaitins (Sankaran advaita). It became convenient to use the label "Advaita" for many pUrvapakShas.
Thus you will find Visistadvaita scholars (in lectures) refer to Bhaskara's school as Bhaskaraadvaita and Yadava's school as Yadavaadvaita when describing the respective philosophies. For example the scholar Sri Adoor Asuri Madhavachariar who explicitly says that Sankara, Bhaskara and Yadavaprakasha all are expounding on "Advaita" only (in the context of explaining the second verse or Ramanuja's Vedartha Sangraha). See around minute 6 of this YouTube video.
There are other modern scholars who will take the effort to explicitly liken the school to Bhedabheda or at the very least call it "Yadava-mata" alone without labeling it Advaita. In fact, Sudarshana Suri in his commentary on the Vedartha Sangraha called Tatparya Dipika refers to the school as Yadavaprakasha-mata. (I will try to find a link to a YouTube video for a modern scholar using this term.)
Interestingly, Patrick Olivelle in his introduction to the Yatidharmasamuchchaya of Yadavaprakasha remarks:
The Sri-Vaishnava tradition, indeed, claims Bhaskara and Yadava as its
spiritual ancestors in in their opposition to the absolute monism of
Advaita and to its understanding of ascetic renunciation.
Now I do agree that Yadava's YDS is revered in the Srivaishnava circles and even Vedanta Desika and Nadadur Ammal have high regards for it. However I have never heard of Yadava's philosophy being considered as foundational in its criticism of Sankaran Advaita. Yadava's interpretation of the Chandogya verse "tasya yathA kapyAsam puNDarIkamevamakShiNI" being identical to that of Adi Sankara, and Ramanuja being deeply disturbed by the analogy in the interpretation occupies an significant point in hagiographies about Ramanuja's life.
If Olivelle is right (he doesn't cite anything to back up his claim) about Visistadvaitins building up on Yadava's arguments against Sankara, then it is all the more likely that the labeling of Yadava's philosophy as Advaita is a recent development due to ideological/sectarian rivalries.