Do DNS zones help me purge just a subdomain?

I had spent some time coming up with a caching strategy thinking I could purge a subdomain but then found I need to be on the Enterprise plan (I think) to implement it. I then came across this article which gave me some hope: https://www.cloudflare.com/learning/dns/glossary/dns-zone/.

Would a DNS zone help me purge the cache of just a subdomain using the API on the free plan?