Typical misinformation propaganda. The oceans are not acidic. They are still alkaline, though perhaps a little less than in the past. It's just a small shift in the direction of acidity. Big, big difference.
Somewhat like saying that someone who headed West out of Wilmington, NC on I-40 an hour ago is in Los Angeles?
Had the same problem in my 400gal reef tray tank. A?C was out for 4 days mid July in FL. All coral died. Now, one month later it is all returning, polyps everywhere.
CO2 from underwater volcano activity is now speculated to dwarf human CO2 emissions. The warm equatorial water in 1998 was due to El Nino. And conservation of mass and energy imply that if one area warmed, another must have cooled. Watch ice dramatically increase this winter in the upper northern hemisphere. As an El Nino in 2015/16 caused our current fading El Nino atmospheric conditions.