People don’t typically have to approve and submit their super’s work IME so I’m curious what you mean. If they write you unclear slop emails then constantly bother them for clarification until they fix it.
In that case I guess you just keep pressing them to document/make notes. Keep asking questions. Basically take away their “saved time” by dumping the time sink they dumped on you back on them.
There's a danger in it too because (whether it should or not) CTO title carries a level of weight that might result in less scrutiny than an IC (which it should not IMHO). I hope he is encouraging objective reviews and not pushing stuff through on his title.