hmm
I have two Ryet 3D saddles, an Aircode (pro stealth) with 11mo and >6.000km on my road bike
and the same model you linked, on my mtb with ~30hrs on it
I've not experienced this kind of wear on the bib fabric, even riding long hours and moving/changing position when riding, especially on the mtb
so I'd suggest to look at stuff other than the saddle itself
maybe bikefit adjustment? too much movement on the saddle is usually some positioning adjustment, for example you start sliding down and have to constantly move your butt back
or the bib is a bit older and the fabric is not that much resistant anymore