How much you understand what was built is entirely up to you. Literally nothing is stopping you, or anyone else, from having the AI walk you through it, or reading the code yourself if you don’t trust the AI.
What about the threat of unemployment due to not meeting AI usage/output metrics? I've personally found it has effectively coerced me to stop trying to understand pretty much anything, and instead just send out whatever passes basic test to "keep up".
Unless you want to just play bad-faith word games and say that "technically it's still not stopping you" in which case yeah man you got me good job buddy.