Yes, these changes for Morocco have been in tzdata since version 2015e.

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Tim Parenti

2018-05-04 13:43 GMT-04:00 Sebastien WILLEMIJNS <seb@willemijns.com>:
Morocco TZ changes in 8 days... i think the list knew...

https://www.africatopsuccess.com/2018/05/03/maroc-changement-dhoraire-dhiver-des-le-13-mai-prochain/
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  Sébastien WILLEMIJNS