I remember when I played the first one… I like the fact that you’re working on a sequel/remaster.
Anyway… I’m not here to give advice on Yarn, since I don’t use it.
If I can suggest a simpler approach instead… since your game isn’t a visual novel, for simple dialogues like the ones you’re using, I’d go with this system:
You need to delete the action in red (see screenshot below of your events) and replace it with a timer start/reset, as shown in the tutorial you linked to (I might know the guy who made it… ). I have included a screenshot from the tutorial to show how it should be set up.