This changes was in the 2018f release.   I found a more official statement from the Ministry of Energy here:

https://www.gob.cl/noticias/ministerio-de-energia-anuncia-nuevo-regimen-horario-partir-de-2019/

But unlike other Chilean tz/dst changes, I have yet to see a published decree in searching https://www.leychile.cl/ or http://www.diariooficial.interior.gob.cl/

Hopefully this is just pending still.   I would appreciate if someone fluent in Spanish could ask the Ministry of Energy if there is a decree forthcoming to back up their announcement?

Thanks,

Matt

From: tz <tz-bounces@iana.org> on behalf of Paul Eggert <eggert@cs.ucla.edu>
Sent: Monday, August 13, 2018 9:14 AM
To: Tim Parenti; Yonathan Dossow
Cc: Juan Correa; tz
Subject: Re: [tz] Chile changes dates for DST from 2019