Yes, and I'm explaining that a significant part of being an experienced cook is just the understanding that cooking isn't precise. You do not need to work out what sized teaspoons the author was using, just get any of the teaspoons out of your drawer, fill it up, mix it in, and then taste to see if it seems ok. The final result will depend on factors you can't control for - the conditions ingredients were grown in, the age of spices when they were ground, the specific cultivar you're using - and the author doesn't have your personal tastes, so while they can tell you the ingredients to use they can't give you the precise amounts that you'll enjoy. To find that out you need to make the dish repeatedly with small adjustments until you hone in on your tastes.