English is my second language, and the comma separating that particle from the rest of the sentence makes it pretty explicit even for me that it is talking about the platform, at the same semantic level as “powerful”, “extensive” and “to serve your sites […]”.
Yes, but the incongruousness of telling me what language something is written in in its sales one-liner makes me think it must be pitching itself as "especially for apps written in Go", because who thinks I am going to pick a tool because it is written in Go? "Try ElasticSearch, written in Java!"
I avoid new server software written in languages with too many footguns such as c or php. Nginx gets a grandfather exception, but I'm not sure I would have extended one to caddy.