A sentence thrown on to the end of the conclusion should normally be read as reemphasizing the reasons for the conclusion unless it starts with a word like "though" or "however".
I'm not charitable, it's just what made sense, like mentally fixing a typo instead of acting like you don't know, and can't figure out from context what someone meant just because they flubbed a letter or a word or something.
I mean, that's just what's called in Philosophy the principle of charity [0]. When evaluating a claim you should read it in its best light, which include glossing over minor inaccuracies and going straight to the main point.
The last sentence should be :
So in that regard, Alpine is less secure by using musl. However, having a small and understandable system is a real advantage when it comes to security.