Sri Vangipuratthu Nambi in his Virodhi Pariharam Grantham says that when one thinks that “Piratti’s Saraveshvaratvam” and “Brahmikka lakshanamana karanatvam” , that thought itself will act as an obstacle for moksham. If so, are Vishnu and Piratti are different souls (Atamas)? Or are they two forms/incarnations of a single Atama? Similarly, are Sridevi, Bhumidevi and Neeladevi are three different souls or incarnations of a single atma? Pray kindly explain, adiyen Ramanuja dasan. [Here is Vangipurathu Nambi’s Virodhi Pariharangal in Telugu script: https://archive.org/details/in.ernet.dli.2015.396199 And here is the specific page: https://imgur.com/a/c0NUyY1″]

As the preceptors such as Swami Desikan, et al, have not quoted Virodhi Pariharam of Sri Vangipuratthu Nambi, we do not know the details.
Swami Desikan in the Catus Sloki Bhashyam has explained in detail that Piratti and Perumal are two different Souls; and that Sridevi, Bhumidevi, and Neeladevi are three different souls. One must learn these from a preceptor through kalakshepam.
Notes
Based on several authoritative evidentiary statements and texts, Swami Desikan in his granthams has said that the trait of almightiness (Sarveshvaratvam) can be attributed to Piratti. Further, since Swami Desikan himself says that “Tarka pandityatinaale edaiyum saadika vallomaay irukka, naam pramaana saranaraay korugiruom” and that since Swami Desikan is our pramaanam, following his path, let us get clarity that Piratti does possess almightiness.