This is resolved.  We've had a 'cloud-images' module which is the same as the 'uec-images' module for some time.

$ rsync -l rsync://cloud-images.ubuntu.com

cloud-images   	Ubuntu Cloud Images
uec-images     	Ubuntu Enterprise Cloud Images

$ rsync -l rsync://cloud-images.ubuntu.com/cloud-images

drwxr-xr-x          4,096 2017/08/02 12:11:31 .
-rw-rw-r--         17,294 2017/07/21 10:02:55 .htaccess
-rw-r--r--            229 2017/07/29 19:41:40 .manifest
-rw-r--r--          1,043 2017/07/29 19:41:40 .manifest-daily
-rw-r--r--             27 2015/01/22 17:49:57 FOOTER.html
-rw-r--r--          1,322 2016/03/02 20:51:24 HEADER.html
lrwxrwxrwx              2 2009/12/17 14:11:16 server -> ./
lrwxrwxrwx              6 2015/01/07 17:54:29 ubuntu-core -> snappy
drwxr-xr-x          4,096 2012/03/21 13:52:40 appliances
drwxr-xr-x          4,096 2017/08/01 11:43:18 artful
drwxr-xr-x          4,096 2009/10/20 08:47:10 cdicons
drwxr-xr-x          4,096 2016/02/24 15:07:14 daily
drwxrwxr-x          4,096 2017/01/25 08:49:50 desktop
drwxrwxr-x          4,096 2013/08/27 16:00:54 include
drwxr-xr-x          4,096 2016/10/17 09:57:58 locator
drwxrwxr-x          4,096 2017/05/02 21:58:13 precise
drwxr-xr-x          4,096 2017/07/28 15:31:02 query.cn
drwxr-xr-x          4,096 2017/07/28 10:45:48 query.govcloud
drwxr-xr-x          4,096 2017/07/31 14:37:06 query
drwxr-xr-x          4,096 2017/04/13 06:55:59 releases
drwxr-xr-x          4,096 2016/05/11 05:18:00 rss
drwxr-xr-x          4,096 2016/02/24 15:07:19 snappy
drwxr-xr-x          4,096 2017/07/29 21:58:06 trusty
drwxr-xr-x          4,096 2017/01/25 08:48:12 vagrant
drwxr-xr-x          4,096 2017/08/02 09:11:21 xenial
drwxr-xr-x          4,096 2017/07/28 21:58:08 zesty

$ rsync -l rsync://cloud-images.ubuntu.com/uec-images

drwxr-xr-x          4,096 2017/08/02 12:11:31 .
-rw-rw-r--         17,294 2017/07/21 10:02:55 .htaccess
-rw-r--r--            229 2017/07/29 19:41:40 .manifest
-rw-r--r--          1,043 2017/07/29 19:41:40 .manifest-daily
-rw-r--r--             27 2015/01/22 17:49:57 FOOTER.html
-rw-r--r--          1,322 2016/03/02 20:51:24 HEADER.html
lrwxrwxrwx              2 2009/12/17 14:11:16 server -> ./
lrwxrwxrwx              6 2015/01/07 17:54:29 ubuntu-core -> snappy
drwxr-xr-x          4,096 2012/03/21 13:52:40 appliances
drwxr-xr-x          4,096 2017/08/01 11:43:18 artful
drwxr-xr-x          4,096 2009/10/20 08:47:10 cdicons
drwxr-xr-x          4,096 2016/02/24 15:07:14 daily
drwxrwxr-x          4,096 2017/01/25 08:49:50 desktop
drwxrwxr-x          4,096 2013/08/27 16:00:54 include
drwxr-xr-x          4,096 2016/10/17 09:57:58 locator
drwxrwxr-x          4,096 2017/05/02 21:58:13 precise
drwxr-xr-x          4,096 2017/07/28 15:31:02 query.cn
drwxr-xr-x          4,096 2017/07/28 10:45:48 query.govcloud
drwxr-xr-x          4,096 2017/07/31 14:37:06 query
drwxr-xr-x          4,096 2017/04/13 06:55:59 releases
drwxr-xr-x          4,096 2016/05/11 05:18:00 rss
drwxr-xr-x          4,096 2016/02/24 15:07:19 snappy
drwxr-xr-x          4,096 2017/07/29 21:58:06 trusty
drwxr-xr-x          4,096 2017/01/25 08:48:12 vagrant
drwxr-xr-x          4,096 2017/08/02 09:11:21 xenial
drwxr-xr-x          4,096 2017/07/28 21:58:08 zesty