The tyre treads shown twice on the highway look to me like truck retreads/recaps. A common enough sight everywhere.
Though of course this doesn't reduce the importance of the report, I would think that the quality of the manufacture of the individual tyre is of the ultimate importance, because everyone makes a 'lemon' sometimes. Spotting 'bad' tyres would be, I should think, impossible, since until it went, how would you know it was dangerous.
How would you know from the code if it was 1991 or 2001, considering that some codes were 3-figure?
I checked our car. Michelin steelbelts. Manufactured NOT in France, but in the far east. 6 years old.

I can tell if a tyre is running dangerously soft, which means hot, by the feel of the car. Others may not be this sensitive, or may think they are safe until SOMEONE ELSE changes it. I also check the spare pressure every time I do the roadwheels.