This is probably as a concise summary as you could get from there:

> Defendants have now submitted the administrative record justifying those actions. The record is slim. A four-page memorandum, which post dates two of the three challenged actions, provides the entirety of the government’s rationale. Defendants have now backed away from the thrust of their risk assessment, which relied on Anthropic having backdoor access to its technology once deployed in a national security system. It is now clear that Anthropic undisputedly lacks any such access and that, as Defendants concede, Anthropic’s technology is itself no riskier to the national security than any other “black box” artificial intelligence model

I think this both overstates and understates the case. The evidence being weak does not invalidate the decision; as the court notes, the government gets substantial deference on matters of national security.

The invalidation comes from the fact that this is clearly retaliatory behavior for speech; and the evidence for this is fairly strong since the administration has made public statements to that effect.

The evidence being weak means that it is clear that there is no reasonable belief that the cause of action is anything but an attempt to apply a penalty for the use of protected speech.