I think the answer is, as proven in the video, it will, no question. Off axis response with that Rode mic is considerable... especially when you compare to the behaviour observed with the other cab.
So yes, all the other mics in stage, including vocal will be picking up more guitar than when you use another type of cab.
It's a case of compromise... in the pub situation, the directional element that is typical observed by the audience will be greatly reduced... at the cost of more spillage into any open mics across the stage. It's how well you can balance that which will be key... because at the end of the day, having the vocals sit above the instrumentation is of highest importance.