If they're not frayed, don't directly conclude that they're not HD. With the Chinese hand-tied laces, some real HD Lace come without fray and will become frayed once you touch the edge (where transparent one will not).

This is the result of some small change in production as they get hand-tied in China now, when they were first hand-tied in N. Korea. They're laser cut here leaving a straight edge. They can be easily made to be frayed, but it's up to suppliers whether they do it or not

It's always been common to have single at the front and double throughout the lace. Single knots all throughout would affect the lifespan of the product, so it's done on purpose