The fridge emailed basically a performance report to the address that he configured on setup. One of the performance report items is that it had been opened a lot, which does impact efficiency and food longevity.
It didn't email a complaint. It did precisely what he configured it to do (I will go on a limb and presume the fridge didn't guess his email address), and presumably what he expected it to do given that he paid a large premium for a "smart" fridge.
There is no problem here beyond that often Twitter makes everyone a comedian/performance artist and people often take their routines a little too seriously.