As mentioned, it allows it to fly a less predictable path due to unlimited range. It can be programmed to choose flight paths that more easily avoid radars. So yes, it is more difficult to target, but cruise missiles in themselves are difficult to find in ground clutter and the nap of the earth anyways.
The hypersonic cruise missile is more easily seen as it flies at high altitude, but compresses the reaction time of the defenses because it is so fast. Either variety is difficult, just if you want to go fast and seen or slow and unseen.
Now a subsonic earth hugging stealthy cruise missile is fearsome, like the nuke one below. There are different degrees of stealth though and we have JASSM, which is tactical and low observable.
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