From what they list on the website, they don’t offer N+2 reliability / they are not present in sufficient geos to actually act as a CDN.
As I mentioned upthread, statichost.eu uses Bunny under the covers, and I think you'd be hard-pressed to argue that Bunny isn't a CDN.
surge.sh has servers in 10 regions.[0]
It's not trivial to run a static host with redundancy in multiple regions, but it's also not so absurdly complex that only large vendors can achieve it.