The GT500 package seems to have the same fate. The only car of three (the Nissan GT-R) was released in February of 2017, since then there haven't been any news. And unlike the announced LMP cars these cars are still up-to-date. Which didn't prevent them from starting yet another project, a GTE package (which only includes the Ford GT so far...)Short version: Released LMP1 pack with 5 (?) cars for 10 Euros back before Kunos released their first LMP1, promised more content and updates like working Hybrid, didn't deliver on promise, kept all their released content up to date though.
It really seems like as soon as URD doesn't have to fulfil an ironclad contract they pretty much do what's in their mood.