I bet there is are least one or two kilo people who use it unironically.
Jokes aside, there is a different between a metric system and the metric system, and also between not wrong and right but at this point I'm just nitpicking that people shouldn't be so nitpicky. Don't take me serious.
Are you talking about SI unites? I mean, sure, there is overlap but the metric system is what people use in everyday life and SI is a scientific system where you don't even use prefixes (like kilo) but just powers of 10. In no case to people use kiloseconds
You were ahead of your time