I sent an email very similar to the one from leandrorar and got a response from LAN today saying that my comments would be "analyzed". They at least mentioned the problem by name ("We inform you that we have received the mail where you request that our new way to earn kilometers to be re-evaluated.") so if it is a cookie-cutter letter, then they have definitely been receiving complaints.

I have two LAN flights (LIM-LPB and LIM-GYE) booked on a mix of O and Y fare buckets. Will be interesting to see if I actually earn 12.5% EQM miles on American. Should be a whopping 82 or 88 miles for each leg