aulero: I often refrain from explaining my personal views because writing in english is an hard matter for me and I have always little time. But in this case I fill myself obliged to answer and clarify.
ABOUT MORPHY AND KERES
When I heard speaking about matchs between players of different epochs I wonder what the speakers really mean. So let us analyze what the "Morphy - Keres" match could mean.
A) Both Keres and Morphy with the relative knowlodge of their times?
In this case Keres would have won near all games. Not all games because Morphy was a so great natural player that surely would have learnt from the defeats how adapting his play to avoid a complete failure.
B) Keres with the chess knowledge of Morphy' time?
Well I suppose the result would have been similar to the "Morphy - Anderssen" match. Morphy introduces a new way to play and we cannot assume that Keres could have introduced a comparable one. If the Keres we know "played like Morphy" is because Morphy existed and "showed something".
C) Morphy with the chess knowledge of Keres' time?
Well it makes more sense to me. The answer is uncertain and depends on personal opinions. The real fact is that we do not have any idea how Morphy could have played in high competitive chess: beeing an instable personality, despite his superior talent, I suppose not very well. Keres proved to be an exceptional player despite dramatic contextual conditions.
ABOUT RACE CARS
I suppose you misunderstood. In the 1930 was possible to construct race cars with the same power of current race cars, but I do not suggest you to take a bend with the old cars at the same speed of new cars. In the same way, it is also possible that the Morphy and Keres "engines" was of the same power, but the former was assembled in a body without the modern technology.
ABOUT THE CURRENT GAME
The main theme of this game is the trap and capture of White's black square bishop. The White's main error is not (in my opinion) a strategic one. Playing 8.♘xe5 - instead of for example 8.♗xe5 - White simply does not calculate that his black square bishop was eventaully lost: this is a tactical error and it does not diminish in any way the value of Keres' performance.