Looking for Context on Dr. Mundo Changes

I was hoping a Rioter might be willing to pop in and give some context on the Dr. Mundo changes we saw hit the PBE today. The changes seem to add power to ap matchups, while reducing his ability to perform in ad matchups. Considering that ad matchups are largely where Dr. Mundo struggles the most, I am concerned that this will do little for Dr. Mundo in his ability to perform top lane. Is Riot intending to push Dr. Mundo into an anti-ap pick more so than he already is? Or is there some other goal that these changes are hoping to achieve?
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