I'm still unsure as to why the M5 has been omitted from this video series so far (perhaps BMW is planning on releasing a separate video series on the M5) but here's the original promotional video on the E34 M5:
One really gets the sense that BMW Motorsport GmbH was proud of their racing heritage and work while having a philosophical commitment in delivering the finest craftsmanship, engineering, and quality to showcase said heritage.
Of course, we know that the E34 M5 was the last M-model to be hand-built and BMW Motorsport GmbH would be renamed BMW M GmbH in 1993.