Has your coach had a history of success coaching the pole vault? Are there athletes on your team that 'row' and jump higher than you?
Regardless of what the answer is, do what your coach ask. My biggest thing I like to tell people about the pole vault is that there are a million different techniques and most of them work. But if you are trying to do one thing, and your coach is trying to get you to do another, it will just be a head ache for everyone.
Fyi. Rowing does not always cause tuck and shoot, it just makes it a little harder to swing your hips up high on the pole (like you would on the high bar). The best rowers I have seen I like to say they 'swing and shoot'. The row helps you get on bigger poles, but it makes your swing have to be lower and tighter, but if you are strong enough you can rip out of it too. It is not what I coach, but people have had success with it.
Several good rowers:https://www.youtube.com/watch?v=Jpg5-R3rbb0https://www.youtube.com/watch?v=L2P4Tg_dCnIhttps://www.youtube.com/watch?v=Xdf8k6XoxbMhttps://www.youtube.com/watch?v=48xbIkLWrFwALSO:
This is not meant to be a discussion about technique. Only that if you chose a college you should buy into the program. So many college athletes constantly complain about how certain training or what their coach is coaching does not work for them, but they never bought in 100%, so they really do not know if it would work or not. Sometimes if you have a good coach and you buy into their program 100% and do not see improvement then the coach will make adjustments from there.