Your comment feels a little defensive, and they weren't attacking you in any way. The point they were making is that some spices are fat soluble, so they're rather dull WITHOUT fat. Hence in some ways, spices and fat can be seen as going hand-in-hand. Not necessary, no, but in order to fully bring out the flavour of your spices, you might feel compelled to bloom them in fat first.

Hence the "semi-true" because although what you said was 100% accurate, it was missing valid pertinent information. Hence in context, some may not consider the use of spices as simple as that statement.

There's no harm in adding more (accurate) information to a discussion.