Yes, it's technically accurate but a case of trying to be a little too accurate.
They had two types of R2-D2 props for Episode IV; a two legged version for Kenny Baker, and a three legged motorized remote controlled version. The remote controlled R2-D2 ended up with prominent rivets, though most people never noticed.
Tamashii Nations made them far too big, and it doesn't help that they're painted in on the figure. At this scale, they should've been needle point small or left off entirely which would've been preferable. Still a beautiful representation of R2-D2 overall, though.
View attachment 557822
Chogokin in Japanese means super-alloy, which was a word made up for a brand of manga, anime, and die-cast toys in the 70's.
C-3PO and R2-D2 were released under the Tamashii Nations brand. They are called Perfect Model Chogokin figures (probably an homage due to their die-cast parts), but they are not part of Bandai's Soul of Chogokin brand.
Bandai's Tamashii Nations division is pretty prominent, especially for the US market. They're in charge of producing the higher end collectibles - mainly figures and props - like Figuarts, Movie Realizations, and Proplicas.
The full name for the Figuarts line is "Bandai Tamashii Nations S.H. Figuarts" but nobody would say that in normal conversation.