Yeah, they said it here[1], and basically, given cause and given notice, they can still access private communications on work property. So not exactly what you are implying.
Thanks for the document. I think it still says that the employer should notify the employee beforehand of any potential monitoring of communications, which is different from assuming that every byte is being monitored.
From the actual source: https://www.echr.coe.int/Documents/Press_Q_A_Barbulescu_ENG....