For what it's worth:
Don't take that article as gospel. There are a few fact-like things there that I believe are wrong, and many subjective things that are inconsistent with general consensus elsewhere (including articles by trusted industry experts, and my own experience). Basically as I read it I was like "WTF?" a few times. I wonder if maybe some of it might have been from a book he read that was written 100 years ago or something.
Allow me to point out a few things...
I question if Virginia is "About 60% of the American tobacco crop" or as popular as it says; I think Burley has that position.
Not an inaccuracy, but in listing classic Burley examples, a few were conspicuously absent: Prince Albert, Sir Walter Raleigh, Carter Hall.
Latakia is no longer from Syria at all, unfortunately. There is an existing stock of Syrian Latakia in warehouses slowly being used up (or, in one case, a warehouse full of it was lost to fire).
False statement about Latakia: "burns and tends to dry out your mouth and throat". That statement applies to Virginia. Latakia is one of the most gentle types; a noob puffing like a freight train on a heavily Latakia blend backed up by Orientals is likely to survive with his tongue intact, whereas a straight Virginia requires care even for the experienced smoker.
Potentially confusing bit about Latakia: While it may be possible that the peasant farmers used camel dung for cooking/heating, camel dung is not used in the production of Latakia. It is not said there but possibly implied and should have been clarified.
Conspicuously absent from Perique description: Has a taste/feel similar to black table pepper. Also like black pepper, in very small amounts you'll never notice it, instead it contributes to a general flavor; but in larger amounts you definitely notice it on its own.
"Havana" -- I have not seen that word used in descriptions of blends; they say "cigar leaf" when cigar tobacco is included. (Side note: I find it weird that so much specificity is used in naming other component tobaccos in pipe blends, but "cigar leaf" could mean many different varieties.)
Cavendish, AFAIK, is almost always made from Burley (though the Cavendish in Newminster #17 is indeed made from Virginia)