That says more about the camera-man and editor of the documentary than of Gibson's interest in bass guitars.
I'm not referring to set-up shots or the host's interactions, which followed the production of the Les Paul Standard; the background video in the cuts and transistion shots (we call it B-roll) of the factory's various buildings showed what was being produced, period. There was no editing involved to feature anything above anything else. After too many years in TV, I can say with authority that the object of my observations was in no way slanted to present any type of instrument over another.
I was quite surprised at the number of Firebird bodies, (undoubtedly for those legions of Firebird X sales- the episode is new) which were only slightly outnumbered by SG's. Les Paul guitars compromised over half of what I saw, but I'd say the rest was just under 25% each of SG's and Firebirds with a small number of large solid-bodied guitars. The single SG bass was actually referred to by the host; it was on a cart of instruments going to final finishing (setup, not finish application.) Even accounting for duplicate shots, the content of each building was pretty uniform. There looked to be the same model percentages with rough cut bodies, finished bodies, and necks. Since the whole show was most likely shot in a day or two, it's not like Gibson or the show was trying to showcase anything other than just what was there on a normal day-to day basis.
FWIW, every time I've been there, the Gibson outlet in the Opry Mills Mall had hundreds of guitars, but only two T-Birds and three Tobias basses not counting the two Epi's and three or four used basses which were imports.