Communication is a superpower. You say something and the other person understands.

Being pedantic about words means you think effective communication is somehow wrong. Be precise, don’t be pedantic.

People commonly use this expression in everyday conversation, such as, "you could save 10 times as much if you would just shop at Costco." So I agree with OP, their comment is correct but pedantic.

> People commonly

Your example them was a weasel worded advert that uses meaningless terminology to make something sound big (savings in this case).

People don't use that expression.