What's difference between could choose and could have chosen in this sentence?

A story is only as believable as the storyteller. For story to be effective, trust must be established. Yes, trust. Whenever someone stops to listen to you, an element of unspoken trust exists. Your listener unconsciously trusts you to say something worthwhile to him, something that will not waste his time. The few minutes of attention he is giving you is sacrificial. He could choose to spend his time elsewhere, yet he has stopped to respect your part in a conversation. This is where story comes in. Because a story illustrates points clearly and often bridges topics easily, trust can be established quickly, and recognizing this time element to story is essential to trust. Respecting your listener’s time is the capital letter at the beginning of your sentence ― it leads the conversation into a sentence worth listening to if trust is earned and not taken for granted.

What is the difference between could and could have pp in this sentence.
I know "could" is referred to possibility and "could have pp" to hypothetical past inability.

But I can’t feel the nuance between 1) and 2)… plz explain these with ease and logic

1. He could choose to spend his time elsewhere, yet he has stopped to respect your part in a conversation.

2. He could have chosen to spend his time elsewhere, yet he has stopped to respect your part in a conversation.