Has Google actually claimed that these employees are the ones that leaked the information? The statements I've read, including the one above, do not explicitly

Has Google actually claimed that these employees are the ones that leaked the information? The statements I've read, including the one above, do not explicitly say this. Rather, they say that some of the easily accessible information those employees looked at was leaked. Either Google has proof that it was the fired employees and are being weirdly vague about it, or they don't actually know that it was them. If it's the latter, that is extremely scummy on Google's part to heavily imply it was those employees without proof.