No, it's perfectly clear.

Evidence comes in many forms. There doesn't appear to be evidence in the form of a recovered weapon or technical recording/logging of an attack as it happened, at least nothing that has been disclosed.

However, the injuries are real and ongoing. It took a long time for consensus agreement that these events were malicious targeting by hostile govts against our diplomats, using remote energy weapons. Even just with the evidence made public, it's the most plausible explanation.