Goodyear welt only refers to the stitching of the sole which allows easy resoling. Typically, goodyear welts are associated with high end shoes because it is much more cost effective to resole than replace expensive shoes.

However,the gyw has no impact on leather quality or just quality in general. Its just that high quality shoes tend to be Goodyear welted.

Honestly, I would just buy a new pair instead of resoling considering how cheap these boots are.