As stated in the article, street jokes as a general rule are NOT considered stand-up comedy material. That is more true in the comedy club market more than any other.

However, there are exceptions even in that market depending on a number of factors (type of street joke, editing, customizing or otherwise adapting, use frequency which should be rare, etc.)

Outside the comedy club market (which is where most of the good paying work is) properly selected and edited street jokes can absolutely be a most valuable tool for comedians.

But you would really need to have experience in those markets to understand why.

Depends on when and where you are using them and if the street joke is edited and personalized.