What do you mean by would have performed, wrt admissions or ability to handle Cal Tech? Test blind hasn’t been around for long so there wouldn’t be data on how non-submitters handled the coursework.
We definitely know the accepted student profile from previous years - 25/75 was 1530-1570, Math was 790/800, Verbal was 740/760 according to their 2019/2020 CDS. Typically the applicant profile is higher, but for Cal Tech, there’s not much room to go.