That tweet was sent out around and the time the project website was edited to immediately indicate the end of the study (instead of continuing it to the spring)

That tweet was sent out around and the time the project website was edited to immediately indicate the end of the study (instead of continuing it to the spring), and adding a FAQ that tries to dispel concerns about IRB approval and email address harvesting. That makes it seem unlikely he was unaware of the negative responses to his study.