I think we don't judge the signature as the be-all and end-all to an institution's view on reforming research assessment. There are many parallel change movements that exist in our community beyond DORA that have similar messaging.
As I mentioned earlier.... For instance, I know of organizations in this country that have reached out, with senior leadership, and they're going ahead with reforming research assessment without signing DORA. There's no requirement to sign DORA to begin this approach in one's work.