They will still be purebred, but they will not be in the default standard of perfection. You will have problems with the color that will be "diluted" (I don't know how to correctly write that expression in English, but the colors will not be intense, even if they are silver or gold).
There are many variations of laced colors in Wyandotte and they are created from the basic silver and gold colors. But these are only colors, nothing to do with sexlinking!
A long time ago, I bought a "silver laced wyandotte" from a breeder, later I found out that he mixed several colors, in fact his chickens were released free range and they mated with each other, different colors, in blood relations..... the result was this (see picture), lots of different colors, no traces of sexlink, very sick chickens.
I had no luck with those chickens in raising their offspring. They had a lot of hidden genes that caused a lot of problems in coloring. The black border around the feathers (laced) was very bad, broken, irregular....
I repeat, I didn't notice any color differences between males and females!
View attachment 3327848Here you can see two gold laced male and female,product of silver laced and gold laced.
Shure,hen have intense red coulor,but i have also look like roosters(no pic.sorry)
View attachment 3327849Wtf is this

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View attachment 3327850View attachment 3327851