It doesn't say 1k per day. Not saying I agree with the statement per se, but it's a much weaker statement than that.
I am one of the most pro vibe-coding^H^H^H^H engineering people I know, and i am like "one claude code max $200/mo and one codex $200/mo will keep you super stressed out to keep them busy" (at least before the new generation of models I would hit limits on one but never both - my human inefficiency in tech-leading these AIs was the limit)
Also the eat tokens may be compared to single-tasking - when agent swarms move faster, I need to come back to that task sooner, slowing down the multi-tasking that allowed me to use a full 20x max subscription... so the overall usage once that is taken into account is smaller.