i didn't see this note before i went this morning. i mentioned at the border at peace bridge that we are going to do biometrics and the border officer let us go with no questions. they are aware of this and seem have no issue with it.
however, when we come back to canada, the officer at rainbow bridge seems never heard about biometrics, i have to show him the letter what it is.
hope it helps.
btw, it took me 5 hours to drive back and forth from Toronto, it took 15 minutes for the whole process, including security check, using washroom