Well based on what was said in the announcement, Lateks will atleast be coaching for split 2.
Hard to judge coaches because we don't fully know what is going on behind the scenes.
Erik seemed like a good coach however if we are basing this decision on what he has done in NAVI, throughout his entire tenure, it could be warranted.
If you are only thinking about this change based on what happened this split then it seems very harsh, almost unfair.
Erik will probably find a good coaching position soon, even if this may be in a different region.
I personally don't know enough about Lateks to hold an opinion.