SSLKillSwitch2 seems to use the same technique for iOS 13

https://github.com/nabla-c0d3/ssl-kill-switch2/pull/72/files

Pretty sure this will work on iOS 13 too

https://codeshare.frida.re/@machoreverser/ios12-ssl-bypass/

Here's another Frida snippet that'll extract the TLS keys so traffic can be decrypted (magic number in the code might need changing for iOS 13 though)

https://codeshare.frida.re/@andydavies/ios-tls-keylogger/

there also was no introduction of yet another networking library rewrite, so I would assume the iOS12 solution continues to work with iOS13