My car had less than 20 miles on it when I picked it up. This HAS to be a demo car, and very low chance those 327 miles were kept under 4000rpm and in tour mode. So, not a standard break-in
Read the lotus break-in again. Yes, it says to avoid going outside Tour Mode, and it says (paraphrasing) "do not sustain drive above 4k rpm". In the first 1k miles you should absolutely be going through the full rev range. You should take to red-line and engine brake, and spend time varying the revs.
I know my dealership was "bad" about stating as you have, I thought it was a weird thing to say, and the owners manual backs up. You should be seeing revs over 4k, just don't drive on the highway cruising at 4k+ rpm.
I think OP has plenty of info at this point telling him that he should not buy that car without a substantial discount, but unless the dealership was completely negligent engine damage is unlikely, and certainly not because the car saw 5000 rpm before it was out of break-in period.