If the engine I'd (briefly) had from him under his old trading name had been opened, ever, then I'd be amazed. I don't have a problem with that, as i'd rather have an un-molested engine, but it called all else into doubt too.
I found out the 'under 30k km' part was bollocks after phoning SMR directly to confirm it. The engine itself didn't look too bad, but you're meant to be getting a low-mileage, bare engine, that's supposedly been stripped and re-built. I found that doubtful.
As a caveat; that was about 2 years ago now, so things might be different, but I would check all aspects of what is being claimed before spending money.