Yeah, I caught that too...
Catholicism is seen as holding to a form of "supersessionism " which designates the belief that the Christian Church has replaced the Israelites as God's chosen people. As can be seen, this includes different degrees of replacement theology. I am refuting the premise that this means the church has wholly replaced Israel as the inheritor of all the promises.
To be more succinct: supersessionism is an invention of the Roman church - It is their doctrine, and they are the progenitor thereof - It having only been borrowed into early Protestantism's foundations. It is not until the rise of Zionism, accompanied by a resurgence and awakening within the Protestants in the late 1800's that Replacement Theology began to lose it's footing, soon followed by the establishment of Israel, whose establishment set prophetic bells to pealing... Those clinging to supersessionism remain blinded to what is certainly happening right before their eyes, even as they have been for millennia.
It is Replacement Theology which has driven 'christian' antisemitism all that time, so IMHO, your statement above is all too polite - The Roman church does not merely 'hold to' Replacement Theology - They are historically the primary instigator and practitioner thereof.
Do deny that a hardening toward Christ by natural Israel has come?
Necessarily, I would suppose he must, lest the Jews would not be to blame - And if they were not to blame, then their innocent blood stains his religion, reeling in drunkenness from the golden cup.
But another point - For it is Israel that is blinded... If the Roman church is correct, and they are Israel, then it is THEY, admittedly, who are blinded! In that then, we should pay them absolutely no mind, lest we all fall in a ditch!
Which brings forth the last bit - It is an amazement to me that Replacement Theology only assumes upon itself the good things promised to Israel, heaping the bad things upon the Jews (hence 'christian' antisemitism), Thus it is THEY who promote the distinction, inherent within their doctrine.
Thus I find it disingenuous for the Romanists to accuse the Dispensationalists of that distinction, which in my mind, remains in Protestantism as a whole as an artifact of their (Romanist) doctrine of Replacement Theology... Even among Dispensationalists.
Indeed, ALL Israel is partly blinded, BOTH the House of Israel (Church) AND the House of Judah (Jews). It is the Dispensationalists who first cracked an eye open and began to see. Those who continue forward with eyes tightly shut, do so willingly and willfully.