Sure it is, and sometimes shit happens, but certainly the situation is not ideal. The first guy leaving is bad enough, but alone it could be bad luck, but the second guy is a problem. If it's accurate that the second assistant was let go/fired/whatever because he wasn't skilled enough, then that is something L&P should have known from the beginning. So he wasted more time, and is now on his third assistant in less than two months; that's a bad look.
But it really wouldn't be a big deal, except for the fact that whatever these assistants are working on is vital to the next release. That means L&P is learning in real-time while it's also directly delaying the next release. That's just really poor time management. All of these growing pains that should be worked out behind the scenes, in a low-pressure environment, have instead been pushed to forefront. If this new feature is critical for the update, then he should have been working on it and building his team months ago; otherwise he should have delayed its implementation until a later update.
It's just a bad situation overall.