I know that users need at least 20 rep to talk in chat. But could I invite them to talk? could I give them a link?

I want to send this user to chat, I vote him up to give him some rep, but still doesn't have 20 rep, how the hell could I send him to chat? :) it's getting toooooo long in comment section.

I flagged the question, I think I should help him cuase it's a severe problem.