Its a cool project and Mate Rimac is a hacker type and their whole approach is somewhat unconventional with the whole company being born out of the modified m3 he had but i think the task might just be a bit too huge for them.
The car does exist, but i am skeptical that it has a really good drivability/range/handling/security concept to make it a good product. It costs around $1M and is also super heavy. It is probably more of a halo product to channel attention on their future smaller products like the greyp bike.