Question about some Lowering Springs

While just browsing through some websites I found a set of Lowering Springs (Tein HTech &STech) and the site states that these springs are designed to be used in conjunction with OEM shocks. I always heard never to lower a car on stock shocks but I also never read of a spring that was meant to be used with stock shocks and lower. I was just wondering if these springs are too good to be true or what?

Shocks? We don't even have shocks on our cars, OEM style struts...
Since Tein is know for mainly Coil overs, they should say OEM style struts.

You will still need new struts that can handle drop springs, spring rate.