Only the live action shots were recorded with a wide aspect ratio, and perhaps not even that for the pilot. The CGI was rendered in 4:3 and the final cuts including transitions and VFX where composited in 4:3.
The remaster combines cropped 4:3 but high resolution scans of the original live action footage with (sometimes badly) upscaled versions of CGI and VFX'd shots -- except for the pilot which is fully upscaled and cropped from the original 4:3 broadcast masters with zero high resolution live action footage. I don't know if the pilot footage was actually shot widescreen but if it was then you don't get any of it in the "widescreen" pilot included in the remastered versions.
The remaster combines cropped 4:3 but high resolution scans of the original live action footage with (sometimes badly) upscaled versions of CGI and VFX'd shots -- except for the pilot which is fully upscaled and cropped from the original 4:3 broadcast masters with zero high resolution live action footage. I don't know if the pilot footage was actually shot widescreen but if it was then you don't get any of it in the "widescreen" pilot included in the remastered versions.