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The TTL value for both DNS and a lot of Web cache is a recommendation, it is often not strictly followed depending on the browser and other items. If there is an update of the underlying file it will certainly get updated but if there was no update, the TTL value may not be strictly respected. Depending on your use case if you want to ensure that a deleted file is not served, what you did by purging the cache, is the preferred method to ensure that deleted files are 100% removed.