Hi ,

You can use deprecated method it should not cause any issue , as per latest implementation you can try below code also. Refer 
 

Trigger trigger = _triggerFactory.createTrigger(jobName, groupName, startDate, endDate, cronExpression)

SchedulerEntry schedulerEntry = new SchedulerEntryImpl(className, trigger);

_schedulerEngineHelper.register(messageListener, schedulerEntry, destinationName);

private SchedulerEngineHelper _schedulerEngineHelper;
@Reference
private TriggerFactory _triggerFactory;