Every dwarf conifer I have planted has grown far larger than the tag or looking it up said it would. I think they just love our climate. I didn't fertilize.

Sizes given often for comparatively young specimens 10-20 years old or just plain overly optimistic--commercial sources are trying to sell you the plants and do not want to scare you off.

The 'Azurea' cypress, if it does not get root rot first will soon grow much taller than 6 ft. Sounds like you want something blue and feathery, maybe try a hinoki like 'Blue Feathers'. Hinoki tend to be quite slow.