Decapitating Mountains?

The South peak of Sweden's Kebnekaise mountain was dethroned as that country's highest in 2019 (https://www.theguardian.com/world/2021/aug/18/swedish-mountain-shrinks-by-two-metres-in-a-year-as-glacier-melts). The South peak is topped by a glacier, whereas the North peak (the new holder) is not. What is remarkable, is that climate change has resulted in the South peak losing 20 metres in height since the mid-1990's. The South peak actually lost 2 metres last year. About one third of Sweden's only glacier is now gone.