Custom prefixes

Following this resource (not for XF 2.3 but...), why custom prefixes are not styled by variation?
The syntax of the code is however the same as the original ones
Creating custom prefix styling
Less:

&.label--yellow { .m-labelVariation(black, #ffff91, #e6e687); }
&.label--orange { .m-labelVariation(black, #ffcb00); }

&.label--error { .m-labelVariation(#c84448, #fde9e9, #c84448); }
    
//* CUSTOM PREFIXES
&.label--campBase {...

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