Generally this caveat means the vendor won't support any issues you may experience while using the product in DS. You may find that materials need tweaking to look there best and in some cases complex materials won't work at all.

Also Poser dyamic clothing, Python script wont work in Daz Studio.

That said a lot of content will work fine in Daz Studio id even say the majority. Check the product comments and usually someone will drop a comment in about how well it works in DS or if ey experienced any problems. Also you can contact the seller directly and let them know you would purchase a DS version Or if ey know any reason it wouldnt work.