And some people’s definition of an “engine rebuild” leaves a lot to be desired.
Some consider (seriously) replacing a head gasket or performing a valve job as an engine rebuild.
In cases where the engine is actually removed and disassembled there are a dozen ways of rebuilding it but there is only one correct method.
Before believing too deeply in this rebuilt engine claim I’d want to see some receipts and find out whodunit. At a 170k miles a proper engine rebuild should mean reground crankshaft, bored cylinders, etc. and the paperwork should reflect that.
In this case the engine (IF rebuilt correctly) has a legitimate 40k miles on it.
Now the transmission and suspension components may have 210k on them so that’s something that should be kept in mind.