He’s not proclaiming anything and this has nothing to do with doctrine, faith or morals. These are just changes - for better or for worse - to an already existing administrative procedure.
That said, I think it makes the annulment too easy and gives a bad message, but we shall see.
It has no effect on the doctrine of infallibility because while the process of annulments, even though it bears on an infallible teaching, is not itself an infallible teaching. Doctrines are infallible, not processes. Nevertheless, it is my opinion that the new process clearly undermines the infallibility of the teaching on marriage, despite what the pope says.
The pope is not prevented from being incompetent in his decisions about how to effectively teach and promote the faith.
Check out the articled linked above on the growing dissent within the Vatican.
In front of the camera, Burke said he would “resist” liberal changes — and seemed to caution Francis about the limits of his authority. “One must be very attentive regarding the power of the pope,” Burke told the French news crew. Papal power, Burke warned, “is not absolute.” He added, “The pope does not have the power to change teaching [or] doctrine.”
It's worth the read.
I guess the better question is why do you believe it does?