So yeah that ACF/SCF security issue really was bogus. When the PoC gets published on November 7th, I am "going scorched earth" 🤭 on Matt's reasoning behind necessitating the SCF fork.
Just remember the first line of Matt's post:
"On behalf of the WordPress security team, I am announcing that we are invoking [...] of the plugin directory guidelines and are forking Advanced Custom Fields (ACF) into a new plugin [...] SCF has been updated to remove commercial upsells and fix a security problem."