Well, there we would have to see what Vance said when his microphone was cut off. If having legal status can be achieved by illegally crossing the border and applying for status with CBP one app for sure, all the millions coming in will be legal asylum seekers.
I'm not sure where Vance was ultimately going, but Vance started off saying the CBP one app was created in 2020 before his mic was cut (CBS == lame!), this was to counter the lie that Walz had shouted out about the CPB one app being created in the 90's, which is not accurate.
The fact is, weirdly enough, that the CBP one app apparently began development in 2018 (under Trump's reign) and was released in 2020, also under Trump. I've gotten the impression from reading that Biden/Kamala may have modified it to make it easier for people to come through who use it, but I found it interesting that it appeared to be created under Trump. Either way, it does seem to have created a more streamlined process to get people quick asylum access to the country.