Per Google AI search engine, An
explanation clarifies the "why" behind an event, often taking responsibility to provide context, whereas an
excuse aims to deflect blame and avoid accountability. It seems like the debate is whether he's making excuses (i.e., deflecting blame and avoiding accountability) or searching for an explanation. Given the frequency of these events, and the wide variety in explanations he has provided, it comes across more like excuses. But having said that, I recently got unexpectedly destroyed by a friend on a big climb, pushing lower watts than I expected by 20, and while I didn't make excuses to him, just congratulated him on his fine legs, you better believe I was searching for every possible explanation for why I produced fewer watts than expected. It's natural.