Nah, we have hotfixes ourselves that require server downtime, the term hotfix has no bearing whether it requires servers to cycled hot or a full downtime required. Hotfix is a traditional term for a quick-fix engineering update (QFE), it's made outside of the normal versioning process to fix X issue(s) immediately based on current production code, not the next development. Hence why the version number doesn't go up on the client.