The computer voice runs the 't' of 'tei' with 'gwisgo' so that it sounds like 'gwisgot ei'. Do Welsh speakers also do this?
Words often run together, as in many other languages.
The pause between /t-/ and /-ei/ here is not normal. It is an artefact of the computer voice generation, and the course team has no control over it.
As mentioned in the course notes at various points, the voice is generally pretty good, but it does have occasional oddities.