I think the true figure for some degree of incontinence immediately after surgery is more like 30-40%. Many of those clear up over a period of months to a year to leave perhaps 2% with permanent incontinence. Even that can be treated with a sling or artificial sphincter. Yuk, more surgery
Impotence (ED) is not nearly so hopeful. More like 80% have some degree of ED immediately after surgery. Again this clears slowly over a period of months to two years or so. But there is a significant percentage (30%?, I'm guessing) who never regain full function.
In your Dad's case, with an aggressive cancer, your surgeon may recommend removing a wide margin along with the prostate. This means that his erectile nerves would not be saved resulting in certain impotence after surgery, with a less than 5% chance of natural function ever returning.
Pre-op, I had a Gleason 9, so had a wide margin removed. However even though I now have no natural function, injections work well for me, so things in that department are just as good, if not better than before. The pump (VED) also works with the non-nerve-spared -- but I find it not as good as injections. As a last resort there are penile implants available, which from all accounts are highly effective.
So, although I think your uro is being very optimistic with his 1 to 2%, longer term, your Dad need not feel gloomy. The important thing is to first get rid of the cancer, then tackle the other issues, which can be resolved one way or another. In the short term, your Dad should plan on being both incontinent and impotent -- that way he will not be disappointed.