Imho the text-to-speech really sounds like "gaeth hi" here, though I know it can't be because of the soft mutation of talu. Can native speakers hear this too?
I agree - it does sound like hi. I was not clever enough to notice the treiglad meddwl.
As we explain several times in the 'Hints and Tips', the course team has no control over the computerised voice usual by Duo. On the whole it is pretty good, but it does have a few oddities - we are aware of these, but there is nothing that we can do to get rid of them.
(If 'she' had been paid, it would be:
- Gaeth hi ei thalu heddiw.)