The OP referenced a newly-released compact-disc recording of Scott Joplin's piano music.

Have finally finished, at my convenience, listening to every track on each of the four compact discs.

Summary of conclusions:

the interpreter/pianist on this most recent recording,
is a classically trained musician, and it is the classical training
that comes to the fore in these interpretations.
The performances are meticulous and deliberate. And yes,
there is the question of "fidelity to the intentions of the composer," taken literally. This concerns what is printed at the top of at least thirty of these pieces of music in the original editions:

"Do not play this piece fast.
It is NEVER right to play ragtime fast." (Joplin)

Not to say that all of these performances please me;
some of them set my teeth on edge, to be honest.
The performances that please me, do so for the most subjective of reasons: they tug at the heart, or charm the mind, or get the blood stirring, or whatever.

I wonder what Eubie Blake would make of it. He was old enough to have actually heard Joplin play, although by that time Joplin was very ill.
And Blake lived long enough to nurture a new generation of ragtime fanciers, such as composer William Bolcom who published rags of his own.