Maybe Kodak doesn't provide data sheets anymore because we'll be able to tell which films are really the same.
None of the current films are the same as the old, discontinued emulsions.
Eastman Kodak has had to replace too many constituent components for that, because they no longer have the capacity to manufacture all of those old constituent components themselves, and they either cannot source those old components elsewhere, or they cannot be sourced economically, and/or their are environmental barriers to using them.
In addition, many/most of the old films have needed to be revised due to the change in substrate employed.
EK is a relatively tiny version of what it once was, and they are under constant pressure to reduce costs, if they don't want their resources diverted from photographic film to other growing areas of business for which their technological abilities are well suited.
There are still some people on staff who have knowledge of the older emulsions, but many are gone.
And if they need to divert their relatively scarce resources to preparation of things like completely new datasheets, they have to first convince management that there is an economic benefit likely to flow from that.