The ilab command redesign included in v0.17 introduces a new command structure that follows a resource group design. This means that commands that once were something like ilab chat now are ilab model chat. The new groups are model, data, taxonomy, and config. The commands that fall under these are all of the pre-existing ilab commands just now grouped by the resource which the command commonly deals with.
The old command structure is still aliased to work but will be removed in 0.19.0. This means for 0.17.0 and 0.18.0 the aliases will exist and work as expected.