More specifically, it gets the order of events wrong. Trump's comments about "very fine people" came after the deadly white supremacist rally, so it's misleading to imply that those comments were in encouragement of the killing.
However, it's perfectly valid to construe Trump's comments as praise after the fact for the white supremacist rally, even though he specifically condemned the killing that resulted. Because Trump's assertions that there were "very fine people" on both sides and that there were many people on the alt-right side of that event who were not neo-Nazis or white nationalists are simply not credible claims. Trump was praising somebody. Even praising or encouraging the kind of white supremacists who don't get violent is abhorrent conduct on the part of the president, but the comment upthread exaggerated beyond this.
Right. Trump said that, but that doesn't actually change the fact that that there was no reason for anybody to be showing up to support the alt-right side of that event unless they were in fact a neo-Nazi or white nationalist. Pretending that there was a significant faction of those torch wielders who somehow weren't white supremacists is just silly. But Trump definitely didn't intend to praise the empty set with his "very fine people" comment.