I think what is being denied is not what constitutes Kufr as such, which is a theological and metaphysical question, but instead what a particular group of scholars deems Kufr...Qadi Iyad On The Principle: Denying What Constitutes Kufr is Kufr
I would side with the Qur'an against this "consensus" or against any esteemed personage:The advocate of all of this [that even in the area of fundamental beliefs every one who seeks to learn the truth is right and his opinion is acceptable before Allah even if he is wrong even the Christians and Jews and Fire-worshippers] is an unbeliever for there is Consensus among the Muslims that whoever doesn’t declare the Christians and Jews to be unbelievers is an unbeliever, and that whoever advocates a religion other than Islam, or vacillates, or has any doubts, about the unbelief of those who advocate any other religion [he too is an unbeliever].
Lo! We did reveal the Torah, wherein is guidance and a light. . . (5:44)
Let the People of the Gospel judge by that which Allah hath revealed therein. . . (5:47)
Lo! Those who believe (in that which is revealed unto thee, Muhammad), and those who are Jews, and Christians, and Sabaeans - whoever believeth in Allah and the Last Day and doeth right - surely their reward is with their Lord, and there shall no fear come upon them neither shall they grieve. (2:62)
Of course we've been over this all before. What some Muslim venerables choose too explain away or ignore cannot concern me to greatly. If believing that only your cliche has God's ear keeps you vigilant in observing God's rights then all praises are God's. Just be careful with how you play the takfir game--it affords you certain easy certitudes, but its is also a slippery slope. . .