Yes. It’s not legal to coach a witness in that way and in particular in real time. Apparently the dude was Lithuanian but was bringing an action in the UK. This is relevant because he had a Lithuanian lawyer attending via video link who claimed not to be acting for him. The judge thought that was fishy and terminated the video link. The guy started playing for time instead of answering questions and they noticed the smart glasses. When they removed his glasses his mobile phone in his pocket came on speakerphone with the voice of someone reading out the answers he should give.
Bottom line: all his evidence was deemed untrustworthy and thrown out and the judge found for the defendant in the entirety.