It appears to be. Zinc is the default http client/server package.

  $ curl -I https://www.pharo.org/features
  HTTP/1.1 200 OK
  Date: Tue, 21 Jul 2020 05:18:23 GMT
  Server: Zinc HTTP Components 1.0
  Content-Type: text/html;charset=utf-8
  Content-Length: 27546
  Connection: close

Not sure how common it is to have it serve traffic directly instead of through a reverse proxy like nginx though.