Earlier quoted context omitted.
Well, you had to go to #2 of several definitions in an American English dictionary for that secondary devolved meaning. Additionally, " heartily interested" in English usage implies an enthusiastic excess, large amounts, etc. Still, it appears we agree about the original and primary usage. As does your link via #1 You're doing okay on stope angle I'm guessing.
Let me guess: you're also the kind of insufferable (and similarly incorrect) pedant who insists that "decimate" still means "reduce by one tenth"?
Try harder.
Gourmand still, in large parts of the English speaking world, carries large overtones of excessive eating under the guise of quality eating.
If I were to make a guess, I suspect that in your part of the world some of the French persuasion made frequent reference to those that overstack their plates as gourmands and it has since locally become synonymous with gourmet as the troll escaped them.