I don't agree. East/West can certainly vouch for the result based on the information shown because the Accept screen displays the table number, the board number, the contract and result. EW should know the table number they are seated at and the board number that they have just played. They need no other information in order to be able to vouch for the result. If they are inadvertently seated at the wrong table then, of course, they should not have played the board against this particular NS. However, both NS and EW should have checked at the start of the round that they are in the correct place - it's too late after the board has been played, they have already created a major problem for the director.
Paper travellers are a different matter because NS can fill in the pair number information on the traveller incorrectly, and therefore it's important that EW check it. When entering results via BridgePal the NS and EW pair numbers are filled in by the system, not by NS, thus eliminating the possibility of human error and the need for EW to check. Nevertheless, if they are still concerned they can look at the traveller screen which appears immediately after they have tapped the ACCEPT button. The traveller screen does show the NS and EW pair numbers for all tables that have played that board. It also features an ERROR button, so it's possible to go back and make a correction to the contract or result if an error is detected at that stage.