Answer
(Fatwa: 296/242/B=1433)
The Suffah is a holy and sacred place. No hadith mentions any special virtue in offering nafl salah there. People offer two rakah nafl salah and supplicate there to seek blessings. It is ignorance to say it shirk. You should study the hadith in which hadith it has been mentioned that it is shirk to offer salah in suffah. What has been mentioned in the hadith of Muslim Sharif it is regarding Jews and Christians that they made the graves of their Prophets a place of worship. There is another Hadith regarding out Prophet (صلى الله عليه وسلم):
لا تجعلوا قبري عيدا.
Alhamdulillah, it has been practiced till today that no one made the grave of holy Prophet Muhammad (صلى الله عليه وسلم) a place of worship. Suffah is a separate place in some other side from the grave of the holy Prophet Muhammad (صلى الله عليه وسلم). It is ignorance to consider offering salah at Suffah like of that offering at the holy grave of the holy Prophet (صلى الله عليه وسلم). One should not pay any attention towards the words of such ignorant people.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband