A framework is just base code that you load up somewhere and then customize. Webflow you design everything from the ground up…true you aren’t hand coding but I don’t think that’s an issue.
I doubt your “smart guy” is writing every Wordpress plugin they use or possibly even the theme.
I’ve never been into splitting hairs about if something is a theme, framework or generator. Is it getting the job done? That’s the real question.
My only issue with Webflow is the updates…it would be nice to know what’s changing in advance and when the updates are happening. With the last update, I did have a slider on the homepage of a site stop loading. HOWEVER, I’ve also had Wordpress sites completely crash due to something a client did or because of an update to the core or a plugin.