100% yanny - although I can hear Laurel in the slowed-down version (but that could just as easily just be someone going "yanny yanny yanny laurel" for all I know).
I asked 2yo DS and he hears yanny too.
Are both yanny and Laurel in the recording but your brain only chooses to hear one of them at a time, is that it? I guess that's the reason for the crackly "interference" noise in the background?
Head melted anyway.