When the majority of the crop grows after Pesach, he brings a second Heter to use imports as the second Safek. He unequivocally specifies that this second Heter also requires a majority, and in lieu of that it will not apply. Again this majority does not exist today in the USA.
So, the Rema bring two potential Heteirim for Chodosh, and stipulates that both of them require at least one Safek to be 50-50. When that does not exist, he would clearly concede that there is NO Heter. That is precisely the case in the USA today.