Sorry, I don't buy the connection between Masonry and alchemy. Comparing symbols like the crucible and the MM apron I see as a coincidence. There were many symbols for the crucible in his graphic, some of them appearing to be cruciate; does this mean Christians are practicing alchemy?
I also do not see the connection between Salt, Sulfur, and Mercury being the same as Corn, Wine, and Oil to dedicate a cornerstone.
Alchemy is more or less proto-chemistry, and it was a necessary step to developing the Science of chemistry we know today, but we have learned to leave behind the chants, the mental attitudes, phases of the moon, and the like, to practice chemistry.
I don't really feel the speaker is using monotone voice to sound more mystical. There is some inflection in his speech, though some people just don't have a lot.
S&F