I had a similar experience with a 'dealer' at a compound in Old Wolverton, MK.
Rx400h, full lexus history, 1 owner, no problems at all apparently.
Turned up, car absolutely filthy, exhaust blowing badly (1st excuse: It's meant to sound like that; 2nd excuse: it's because it's been sitting for a couple of weeks! When I looked underneath and saw the rusty exhaust held together with tinfoil he then offered to pay for HALF the cost of repair if I bought it. He would not accept that it needed replacing despite the fact that it had almost completely disintegrated).
Brakes weak
Car pulling strongly to the left
Aircon not working: "everything has been checked and car is mechanically perfect, no way compressor can be broken". Told me I'd have to get it regassed myself.
Service history suspiciously uniform; same stamp, same pen & handwriting for all services.
Asked about timing belt: "oh no its a chain". I then took great delight in showing him a sticker on the engine cover saying "timing belt changed" with a date (not a recent one of course!).
And finally, of course, he tried to pretend that the car had had an mot 6 months previously whereas in actual fact it would have run out if it wasn't for the 6 month Covid19 extension.
The way he was trying to talk his way round all the issues was very funny in hindsight.
I've forgotten the name of the dealer now but the compound was down a lane next to the Galleon pub in Old Wolverton. Don't go there!
Sorry for going a bit off topic but I guess the point is that if something doesn't feel right I would argue it's not worth persuing. There are some real crooks out there.
Plenty of fish and all that....