That is interesting and I was too engrossed in the talk to even pick up on that the first time through. According to : https://dictionary.cambridge.org/us/pro

That is interesting and I was too engrossed in the talk to even pick up on that the first time through. According to : https://dictionary.cambridge.org/us/pronunciation/english/executable https://dictionary.cambridge.org/us/pronunciation/english/ex... He's using the American pronunciation, and yours is likely the UK version. I've always used the UK pronunciation myself and didn't know there was an alternate way to say it until today.