What an absurd statement! I mean, really...how many of their employees were around for 75 years, or even half of that period? If they haven't been around and exposed to the 75 years of company existence, how are they supposed to leverage it?
If one is going to use that type of logic in self promotion, why not just say "We hire humans...leveraging 10,000 years of human experience"?
This is not to say that none of the company's operating knowledge has accumulated over the years, but I doubt enough of it has accumulated, or remained unchanged, to warrant the implications of necessarily promoting a lengthy company history.
However, not everyone thinks like me. If enough people are impressed by a company's lengthy operating history, I suppose it's worth it for a company to use that to its advantage.