I don't even know what type of content is on Daily Stormer but I presume it is controversial. I find this quote just a tad disingenuous. I understand Cloudflare is well within its rights to decide there are certain companies they won't work with, but to say this causes no harm whatsoever isn't entirely true.
There are very few CDNs that can withstand a DDOS attack, and certainly very rare for a small publishing company to have that capability in-house. If the content you want is under a DDOS attack and unavailable because no CDN will carry it, then yeah, that would kind of suck.
One can always publish to various P2P platforms that are highly DDOS-resistant, but now the audience has some more work to get to it; it's a barrier. Not an impassable one, but a barrier nonetheless.
For the record, I like Cloudflare, but I also really love free speech. The quote struck me as overly minimizing.