This sort of thing has happened to me before, and typically it has come with an unstated, "No, we're just kidding about accepting lower-quality work for your old job. Suck it up and don't bother asking for overtime pay."
I hope your managerial culture is different.
I think our culture genuinely does not care about misleading/inaccurate product descriptions, but I do, and I would feel bad about working at a company where there was nobody at all doing my old job.
I'll begin a job search July 1 if old job is not filled by then (I'm pretty confident it won't be, despite various promises - this company has never yet followed through on anything anywhere near the promised time) but job-searching sucks and I want to avoid it if I can.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.