BR retreats towards home plate. Legal?

[RWASH]

Gang,

I see the NCAA rule and NFHS has the same rule, but I can't find any wording to that extent in the MLB rules. Only reference I see is 7.08 (i) After he has acquired legal possession of a base, he runs the bases in reverse order
for the purpose of confusing the defense or making a travesty of the game. The umpire shall immediately call “Time” and declare the runner out;

But this does not seem to apply either?