I tried this, booting to 13.3 with AMFI enabled on mid 2011 iMac, it did not boot, progress bar does not go past 50%. I reconfigured OCLP to enabled SIP and AMFI then rebooted to 13.3 successfully but because of SIP enabling, post-install patches didn't take effect and I am greeted with unpatched system (no graphics acceleration and no wifi). Reconfigured OCLP to recommended settings and I was able to boot successfully to 13.3 (w/ acceleration and wifi). So in 13.3, AMFI must really be disabled.
But one thing I noticed, with the recommended OCLP settings for 13.3 installed, I booted to 11.7.5. it booted successfully. Then I fired up OCLP 0.6.2 and I noticed that the recommended settings is the same as in 13.3
-SIP: 0x803
-AMFI: disabled
I was thinking that since OCLP states in the "Configure SIP" setting that "OCLP by default knows the most ideal SIP value for your system..." I thought that I will be provided with optimal SIP setting for 11.7.5 but instead, I was given the optimal setting for 13.3. Does this mean 0.6.2 does not recognize Big Sur installations? I have not tested this with Monterey as I don't have it installed. Maybe others who have Monterey can test this.