Well, first it's financial advice, not technological advice. As other commenters have noted, BC is both a technology and a currency. Buffett is addressing the second.

Second, he runs a $300B USD financial and industrial conglomerate that he's assembled in a singular way in the span of his own lifetime. Maybe he has insights that are worth something.

Third, Kernighan is over 70. Ritchie would be, too. Knuth is 76.

I mean, I have no illusions about changing your mind, nor do I care. I just don't want anyone who is reading your comment see it go unchallenged.