The Shia website "Shiapen.com" says:

Maulana Ghulam Hussain Na’eemi of Sahiwa’al, Pakistan was a Sunni scholar who after considerable research converted to the Shi’a Ithna Ashari Faith. The rationale for his conversion was that he had questions that he found the Ahlul’ Sunnah Ulema could not answer satisfactorily. These are those questions; they remain unanswered to this day. Tragically he was martyred for his beliefs, may Allah (swt) reward him and grant him a place in Paradise.

These questions have been answered by Mawlana Mehr Muhammad (d. 2013) in his book Tohfatul Akhyar which is in Urdu language and available online. Mawlana Mehr Muhammad was a student of Shaikh ul Hadith Allama Sayyad Yusuf Banuri (1906-1977). A Barelwi scholar named Allama Muhammad Kashif Iqbal Madani has also answered these questions in his book which is also in Urdu language and available online. So it would be very wrong to say that these questions remain unanswered.