2009 VW Jetta 2.5 L

2009 VW Jetta

Hello:

I had the battery replaced at the dealer 3 months ago and drove it 900 miles since. No signs of a bad alternator or warning lights. Yet dealer says I need a new alternator. Service adviser at VW dealer wrote, “Battery failed load test but also found excess ripple detected. Replaced battery. Retest for bad alternator. Excess ripple is still present. Vehicle has proper charging voltage but excess ripple can cause alternator to overcharge battery and damage cell. Alternator needs to be replaced.”
Does that make sense?