Is this really repairable?

If someone introduces a meaningless term like "latent stress" as an explanation I think it's fair to ask him what he means.

It may be meaningless to you but that does not mean it's meaningless. I have been involved in plastics and plastic fabrications for 40 years and its a term I am very used to hearing, it may be that it is not as relevant in this situation as I assumed it was but I speak from experience not some theoretical understanding.
 
It may be meaningless to you but that does not mean it's meaningless. I have been involved in plastics and plastic fabrications for 40 years and its a term I am very used to hearing

It's odd, then, that Google searches on "latent stress" and "latent stress plastic" don't throw up any relevant hits at all - at least in the first few pages, after which my energy ran out. May I respectfully suggest that if you you the terms "residual stress" and "hidden defect" - they are two different things - you are more likely to be understood. As it is I still don't know which you meant in this case.
 
Returning to the subject of the boat.....

It's a complete basket case. Any one of those bits of hull damage in isolation might be repairable, but all together!!! It would be cheaper, better and safer to buy a new bare hull. But then the engine, electrics and interior woodwork are probably all water-damaged beyond repair. So when you add them in, it becomes virtually a new boat. If it really has been lying around for years, a lot of bits have probably deteriorated quite seriously, but originally there may have been £10k's worth of secondhand hardware on it. The owner has missed his chance.
 
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