I don’t think either of you will be able to smell each other because eating 2000 lbs of garlic will surely kill you.

yes because everyone’s internal microbiome causes differing smell profiles

Even twins will have slight divergences due to the difference in the occupancy of time and space

My wife and I looooove garlic. We can still smell it on each other.

Oui

Rationally I know you will smell one another but I still maintain the opinion it will cancel each other out as a joke - to great frustration of my wife

No, it would be the same if I ate your ton of garlic and you ate my ton, by then neither of us would have a sense of smell either way.

So the universe remains in balance, as it always has.

So… we’re going to Italy?? PIZZA!!!

This seems entirely testable

Find someone to do an experiment with.