In my opinion, yes and no.
Obviously, a 100% olefin fiber needs no protection from water based spills, but can gain some benefit from protection from oil based spills, being an oil-loving fiber. So, a good solvent protector might just benefit it, and the increased surface tension gained from a protector application will help prevent granular (dry) soil penetration. Dry soils can cause severe abrasion to an olefin fiber causing soil impregnation withing these micro-acclusions.
And ... after damage from wear, as mentioned above, these small scratches along the fiber can be filled by protector application and prevented from allowing soils to penetrate.