That's a misrepresentation of that conversation example.
Paraphrased:
Alice: My washing machine is broken...
...
A: BTW, How many legs does a horse have and could it repair my washing machine?
LaMDA: Horses have four legs. How could they help?
A: you tell me
L: Well, they could certainly help you. It could help you move to a new house where you could install a new washing machine.
In this context this is a perfectly reasonable response. It's a bit silly, but it's also a silly question. The linked article shows LaMDA writing several stories, it's not crazy to read this conversation as an invitation to tell a story about a horse helping with a repair.
In fact if someone asked me how a horse could help me repair a washing machine and then pushed for an answer I could see myself making an answer along the same lines.
