It's still applicable because this check for free domain is not needed with current Launch logic. If the user selects the sub-domain (free domain), we don't store it but we unset the domain selection. See https://github.com/Automattic/wp-calypso/blob/trunk/packages/launch/src/hooks/use-domain-selection.ts#L117

Originally posted by @razvanpapadopol in #51741 (comment)

Also see https://github.com/Automattic/wp-calypso/pull/51741/files#r611681336