I have to disagree on this one.
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Maybe it's because I've never seem the Mortis episode it ties into, but it didn't feel tacked on to me. Could they have introduced it sooner, of course. But, it's clear to me that they wanted to leave her a mystery until the end. The whole mystery bit added to the character and the threat she posed. If they had given it away too soon, they tossed the threat of the unknown out the window.
Now I've never been a fan of Abeloth and think he story should have ended several books sooner and had the lost tribe be the main villain instead of becoming cannon fodder for Abeloth.
As for the review posted, I agree largely. Expect for one bit.
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The writer complained that they risked Lucas ruining the story if they decided to readdress Mortis in the cartoon. But they made it very clear that they couldn't completely trust the info given, even if it turns out to be true, because of the source. So that can easily be fixed using that built in out. I actually think it was rather clever of them to work it in rather then risk another Commando situation.