Schweser - Binomial FI duration Bk7 Exam1 AM Q48

Can anyone pls. confirm that the method described in the vigenette - just adding interest rate tree by 25bps is incorrect… I believe the correct method is to shock the yield curve of the treasuries and then calculate a new interest rate tree. Damn Schweser! messing with me in the last moment! I dont want my fragile confidence shattered.