That post would imply that Elliot add this functionality in 5.7.0 but it does not appear to be working in 5.8 beta3, so not sure if Gutenberg broke this or something else is going on. Someone created a plugin to address this issue before Elliot posted that 5.7.0 supports it. But I just installed this plugin and it does not appear to be working in WP 5.0 and ACF Pro 5.8 beta3. https://github.com/andrejpavlovic/acf-conditional-logic-advanced
I guess the only way for me to get around this is to create a Type field that is a select/checkbox list and manually add my values in and then base my conditional logic off of that. Hoping that this functionality will be added back in a future release.
Did a live-stream yesterday showing how to build a @gatsbyjs site using @wp_acf flex fields. While not what some might consider a “page builder” it certainly allows for building pages with various layouts, etc. https://t.co/h0Y1zX5h9h