The title of this post is claiming this slide killed 7 people. That's a pretty bold and accusatory claim that seems to leave out the other failures, right?
Any evidence to support that claim? NASA employees raised concerns about the severity of the damage, which shows the contents of the slide were effectively communicated to NASA engineers, but that leaders ignored them. Thus the slide was not a contributor.
Pretty bad title for a blog post that talks about misleading powerpoint presentations. Some readers might make conclusions from the title alone, instead of reading the whole text below.