If you're assuming the 2036 non-cannon video game transformation, yes it's similar. Though that was based on the actual VF-4 and not the semi-goofy, short neck YF-4. However, that fan drawing looks a lot like the final one here. Seriously, look at Gerwalk. Push the legs forward, the packs forward and change the shape of the shoulder. Same thing.
Now, there are only so many ways to do it and if it were closer to how the actual VF-4 transforms they'd likely have a lawsuit. I just thought that old fan art and the actual design are interesting for being pretty similar. The connotation it was "stolen" is merely a jab at Harmony Gold... you know, because of Robotech.