It would be nice if you could link to whatever blog article you're talking about so we have context. Why do you care about taskeng
specifically or is this just a curiosity question?
You can schedule tasks using the same APIs that you always have and you will interact with them in the same way. The only thing that might change (and it is an implementation detail so it should be fine) is what the parent process is. Scheduled tasks are each their own process so who the parent process is shouldn't really matter.
AFAIK taskeng was a pre-win10 scheduler. Win10 doesn't have it but it could still be there if you upgraded a machine from a previous OS instead of installing from scratch. Also note that I've seen some people report a virus with the same name potentially so there is always that concern as well. There is no such program on my cleanly installed Win10 machines that I can see.