Status of dropped-during-experimental-phase elements

[octref]

It's quite often that CSS proposals changes, and experimental elements disappear or get replaced.

For example, motion was dropped in favor of offset: #314

I also noticed both block-overflow and overflow-block exists in https://github.com/mdn/data/blob/master/css/properties.json. The current spec is using overflow-block, so I guess block-overflow was dropped in favor of it.

Can these properties be removed from the data? If not, I think currently there is no good status for them. Both deprecated and obsolete indicate the property was once supported in the browser.