This doesn't change total legal immigration numbers. It changes how refugees are processed. Being able to stay while your case is adjudicated doesn't give you permanent residency. Having it adjudicated abroad doesn't deny your rights to apply

The "higher standards of evidence, with limited appeals and faster deportations" would lower the number of refugees able to successfully immigrate. FTR, I do not support the Lankford position. Just elevating the details. Ezra Klein's recent interview with Mayorkas outlines the R position on this.