Very glad that Atlantic put it out! And the whistling seems to work, somehowI read somewhere, that the whistle bit wasn’t meant to be in the finished song. It said Otis was writing it still when he recorded the song we now know, as a demo for his band,but hadn’t written a third verse for it so he just whistled for the last bit he was going to write later.
Unfortunately, he died before he could complete it and Atlantic put it out as a single.
I think not
100% whistling