EINs in index files that contain X's rather than digits

[nmayle]

Kaiser is posting index files that contain X's rather than digits for part of the EIN.

Here is a snippet from an example:
{ "plan_id": "XXXXX0390", "plan_id_type": "EIN", "plan_name": "EIN", "plan_market_type": "group" }, { "plan_id": "XXXXX0474", "plan_id_type": "EIN", "plan_name": "EIN", "plan_market_type": "group" }, { "plan_id": "XXXXX6017", "plan_id_type": "EIN", "plan_name": "EIN", "plan_market_type": "group" },

Is this in any way valid?

As you can see from the example, they are also using "EIN" as a plan name.
The documentation of the table of contents (index file) schema seems quite explicit about the requirements for the name: "The plan name and name of plan sponsor and/or insurance company."