It seems very difficult to square this testimony (that Fujistu only remotely tampered with accounts in co-operation with the Post Office), with the core defence

It seems very difficult to square this testimony (that Fujistu only remotely tampered with accounts in co-operation with the Post Office), with the core defence of a number of post office staff (that Fujitsu categorically refuted any suggestion they could alter accounts). It also seems... bizarre that he can claim he was unaware that prosecutions were being carried out.