This mod just overwrites the two vanilla track types
res\config\track\standard.lua
res\config\track\high_speed.lua

and so it also overwrites the overwritten-by-mods tracks with vanilla filenames.

Could you write a script - as this mod is in the category of the name "Script Mod" - to overwrite only the affected values?

res\config\track\standard.lua
t.speedCoeffs = { 1.100652, -57.18314, 0.4600339 }
t.minCurveRadius = 150.0
t.minCurveRadiusBuild = 149.0

res\config\track\high_speed.lua
t.speedCoeffs = { 1.14927, 9.778938, 0.5144713 }
t.minCurveRadius = 150.0
t.minCurveRadiusBuild = 150.0